System And Method For Administration And Operation Of One Or More Mobile Electronic Communications Devices

ABSTRACT

A mobile electronic communications device includes a housing, a memory, a data entry mechanism, a display for visual data, at least one wireless transceiver configured to transmit and receive electromagnetic signals conforming to a plurality of wireless signaling protocols, and a controller. The controller is communicatively connected to the memory, data entry mechanism, and display; and is configured to send and receive data using the at least one wireless transceiver. The controller detects available wireless networks using at least one of the plurality of wireless signaling protocols, compares network identifications of available wireless networks to a predetermined list of network identifications ordered by preference, establishes a wireless network connection with an available wireless network having a network identification corresponding to a most preferred network identification in the predetermined list of network identifications, and executes an authentication process in response to establishing the wireless network connection.

PRIORITY CLAIM

This applications claims priority from U.S. Provisional Application No.61/326,716, which is entitled “System And Method For Administration AndOperation Of One Or More Mobile Electronic Communications Devices” andwas filed on Apr. 22, 2010.

TECHNICAL FIELD

This disclosure relates to wireless communications systems and, moreparticularly, to management and operation of a network of wirelessdevices used for two-way text communications within an enterprise.

BACKGROUND

Mobile electronic communications devices including pagers, cellulartelephones (cell phones), and devices capable of both data and voicecommunications, sometimes referred to as “smartphones,” each providedifferent forms of electronic communications. Pager networks generallyallow for very simple messages or numeric pages to be sent to a smalldevice known as a pager or beeper. The pager devices are viewed assimple devices because they often are only capable of displaying acallback phone number or brief text message. Some pagers have “two-way”functionality that permits them to send simple messages and respond toincoming pages. Cell phones are also well known, and enable two-wayduplex voice communications between the cell phones and landlinetelephones and other cellular telephones. Cellular telephones may alsohave limited data transmission capability including the ability to sendshort text messages using, for example, the Simple Messaging System(SMS). Smartphones are an advanced form of cell phones that provideaccess to both the standard telephony features of a cell phone and tovarious forms of data communications that occur over the World Wide Webvia a web browser, instant messaging application program, and/or emailprogram. Smartphones often provide access to data networks that werepreviously reserved for larger electronic devices, such as desktop ornotebook computers.

While mobile electronic devices have become ubiquitous in modernsociety, the devices that are currently available have drawbacks aswell. Pagers are very simple to use, but existing pager networks arepresently being phased out of use as enterprises increasingly desire theenhanced abilities available through smartphones and the like. Whilecellular telephones, and smartphones in particular, enhance the dataexchanging capabilities in a communication network, they too havedrawbacks. Cellular phones are most useful for voice communicationsbetween a small group of individuals, but become less useful whensending messages to a larger number of devices. While data protocolslike SMS can approximate the alphanumeric functionality of a pager,centrally tracking large numbers of SMS messages to individual mobiledevices, and determining if a message has actually been displayed on themobile device to which it was sent, is not possible in current systemswithout the use of special software on both the device and anothercomputer. Wireless service providers who provide SMS message servicesalso cannot guarantee the delivery times for SMS communications to themobile devices. While smartphones are able to communicate using avariety of network protocols, the complex functionality of smartphonesmay provide too many unused capabilities at prices that render them tooinefficient in time-constrained environments, such as a workplace.

Other problems with cellular telephones and smartphones include thelimited options in centrally controlling and viewing the contents ofcommunications between these devices. For example, an administrator in ahospital cannot read the content of an SMS message sent by Dr. A to Dr.B, or determine if Dr. B received and read the message. Cell phones andsmartphones are also often capable of storing large amounts ofinformation. If a cell phone or smartphone is lost or stolen, much ofthis information is irretrievably lost or becomes available fornefarious purposes.

The problems with current technologies noted above are particularlyacute in situations where a defined group of users need a reliable andsimple communications system using mobile electronic devices. Medicalprofessionals, including doctors, nurses, and other support personnel,working together in a hospital are one such example. Other examplesinclude public agencies, such as police and fire departments. Many ofthese organizations still rely on pagers because of their simplicity,and because pager networks have historically had improved functionalityover alternative mobile communications devices within buildings. Forexample, while modern cellular networks have broad geographic coverage,these networks still have difficulty in sending and receiving signalswith devices within shielded structures, such as hospitals and policeand fire stations. In the past, pager networks had improved coverage inthese structures because of the very low bandwidth requirements ofpagers, and because most pagers only received transmissions from thepager network and did not need to transmit back to the network. Pagersalso provide a broadcast functionality, allowing for “one-to-many”communications where a single message is broadcast to many pagerssimultaneously. In contrast, cellular phone systems generally sendmessages on a slower sequential basis, with one message sent to onerecipient cell phone at a time. Despite these pager system advantages,the limitations in pager functionality in view of other more robust dataexchanging devices render existing pager systems less useful for somemodern professionals.

The drawbacks of current mobile communications devices and networksdescribed above limit the use of these devices. A mobile electronicdevice communications system that allows for complex messaging andcommunications while providing improved reliability and security inshielded buildings is desired.

SUMMARY

A mobile electronic communications device includes a housing, a memory,a data entry mechanism, a display for visual data, at least one wirelesstransceiver, the at least one wireless transceiver configured totransmit and receive electromagnetic signals conforming to a pluralityof wireless signaling protocols, and a controller. The controller iscommunicatively connected to the memory, data entry mechanism, anddisplay; and is configured to send and receive data using the at leastone wireless transceiver. The controller is additionally configured todetect available wireless networks that the at least one wirelesstransceiver is able to send and receive data from using at least one ofthe plurality of wireless signaling protocols, detect available wirelessnetworks the at least one wireless transceiver is able to send andreceive data from using at least one of the plurality of wirelesssignaling protocols, compare network identifications of availablewireless networks to a predetermined list of network identificationsordered by preference, establish a wireless network connection with anavailable wireless network having a network identification correspondingto a most preferred network identification in the predetermined list ofnetwork identifications for which a wireless network is available, andexecute an authentication process in response to establishing thewireless network connection.

A system for managing mobile electronic communications devices includesa user directory database configured to hold authentication dataassociated with at least one user, an authentication authoritycommunicatively connected to the user directory database, anadministration server configured to send and receive command messageswith one or more mobile electronic communications devices, and amessaging server configured to send and receive messages with at leastone mobile electronic communications device. The authenticationauthority configured to accept or deny authentication data for a userreceived from at least one mobile electronic communications device, torecord the status of authenticated users in the user directory database,and to store an association between each authenticated user and eachmobile electronic device that sent authentication data for theauthenticated user in the user directory database. The authenticationauthority, administration server, and messaging server are configured tosend and receive data via a data communications network.

An application program stored on a computer readable medium instructs acontroller in a two-way electronic communications device to enable oneof a first wireless transceiver and a second wireless transceiver fordata communication and to disable the other of the first wirelesstransceiver and the second wireless transceiver for data communicationin response to a detected network identifier obtained without userinteraction.

A method for delivering data from a first network computing device to asubscriber computing device includes establishing at least one publishernode in a network computing device, configuring a subscriber computingdevice with a subscription to the at least one publisher node,generating a data message for publication by the at least one publishernode, transmitting the data message from the at least one publisher nodeto the subscriber computing device with the subscription, generating areceipt message in the subscriber computing device that corresponds tothe data message, and transmitting the receipt message from thesubscriber computing device to the network computing device.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic block diagram of a mobile electroniccommunications device.

FIG. 2 is a diagram depicting a control system and communicationsnetworks suitable for use with the mobile electronic communicationsdevice of FIG. 1.

FIG. 3A is a schematic block diagram of one embodiment of a controlsystem.

FIG. 3B is a schematic block diagram of another embodiment of a controlsystem.

FIG. 4 is a front view of the exterior of an example mobile electroniccommunications device.

FIG. 5 is a flow diagram of a method for initializing a mobileelectronic communications device for use with a control system.

FIG. 6 is a flow diagram of an alternative method for initializing amobile electronic communications device.

FIG. 7 is a flow diagram of a method for controlling user access to amobile messenger device.

FIG. 8 is a flow diagram of a method for selecting a wireless network toestablish a network connection with.

FIG. 9 is a flow diagram of a method for sending and receivingcommunications messages.

FIG. 10 is a flow diagram of a method for deleting data from a mobileelectronic communications device after a second device is initialized.

FIG. 11 is a flow diagram of a method that locates a mobile electronicdevice by operating the device to emit a sound.

FIG. 12 is a flow diagram of a method for adjusting the volume level ofa mobile electronic communications device.

FIG. 13 is a flow diagram of a method for distributing address bookinformation to a plurality of computing devices using apublisher-subscriber network model.

FIG. 14 is a flow diagram of a method for sending control andconfiguration messages to a plurality of computing devices using apublisher-subscriber network model.

FIG. 15 is a flow diagram of a method employed by a computing device toselectively send reporting information to a plurality of recipientsusing a publisher-subscriber network model.

FIG. 16 is a flow diagram of a method for delivering published contentto a subscriber using a publisher-subscriber network model.

FIG. 17 is a flow diagram of a method for sending compressed databetween multiple computing devices.

DETAILED DESCRIPTION

For the purposes of promoting an understanding of the principles of theembodiments disclosed herein, reference is now made to the drawings anddescriptions in the following written specification. The term “mobileelectronic communications device,” refers to a range of hand-held orotherwise portable electronic devices that facilitate communication bysending data or voice signals through data networks. As used herein, a“mobile messenger” is a type of mobile electronic communications deviceembodying the features disclosed herein.

The term “controller” as used herein refers to an electronic controlunit, typically including a microprocessor, but may include any suchcontrol capable device such as an ASIC, FPGA, a general purpose CPU,such as a CPU from the ARM family or x86 family, or any data processingdevice adapted to send and receive data, and to control the operationsof the mobile messenger. The term “data storage” refers to any devicecapable of storing and retrieving digital information in a manner thatmay be used by the controller. Common examples include, but are notlimited to, Dynamic Random Access Memory (DRAM), and Static RandomAccess Memory (SRAM). The term also includes any non-volatile datastorage devices that are capable of retaining digital information ifelectrical power is removed from any of the controller or memory. Suchdevices include magnetic hard drives, solid-state storage devicesincluding NAND or NOR flash memory, optical data storage devices, or anydevice capable of retaining digital data in the absence of an electricalpower source. The controller operates the mobile messenger in accordancewith one or more software programs that are read from a data storagedevice in the mobile messenger.

As used herein, the term “configure” refers to an operation of acomputing device including mobile electronic communications deviceswhereby the computing device stores programmed instructions and/orparametric data in a computer readable media, such as a volatile ornon-volatile memory, hard drive, solid state drive, or the like. Theprogrammed instructions are executed by various processors, including acontroller in a mobile electronic communications device and one or moreprocessors in a server to perform a function or task. Parametric data,also referred to as configuration data, include any stored data that theprogrammed instructions refer to during performance of the functions andtasks. Examples include, but are not limited to, user authenticationdata, directory information, and lists of wireless access points. Aconfigured computing device executes the stored program instructions,and the program instructions may reference stored parametric data duringexecution.

Mobile electronic communications devices may include wirelesstransceivers, where a “wireless transceiver” is any device capable oftransmitting and receiving information via electromagnetic signals thatdo not require a physical cable or connection for propagation. Commonexamples include radio, microwave, infra-red, laser, and opticaltransceivers. The term “wireless network” as used herein describes anyarrangement of two or more electronic devices capable of sending andreceiving data where at least one device uses a wireless transceiver tosend and receive data. Common examples of wireless technologies oftenused over broad geographic areas include cellular networks, 3G, 4G, andother wireless wide-area network (WWAN) technologies. Other examples ofwireless networks for use within narrower geographic areas includewireless local-area networks (WLAN). WLAN technologies include devicesusing the IEEE 802.11 series of protocols including “Wi-Fi” brandeddevices, devices linked via Bluetooth, or devices that exchangeinformation using optical or infra-red signaling. A wireless network mayalso include two or more devices equipped with wireless transceiversthat communicate with each other directly instead of using anintermediate data network. Common examples of these networks includepoint-to-point communications using infrared transceivers, pairedBluetooth radio transceivers, and ad-hoc 802.11 networks.

Various types of messages may be sent using a WWAN or WLAN including“communications messages” and “command messages”. A communicationsmessage may be any form of digital data that may be sent between themobile messengers as discrete messages. Communications messages include,but are not limited to, text messages including optional metadata toprovide formatting such as font and color metadata, emails, photographs,audio messages, video messages, and numeric pages. Communicationsmessages may also have a variety metadata, including the sender andrecipient of the message, the time when the message was sent andreceived, priority information, one or more predetermined responses thatrecipients may send when responding to the message, and statusinformation indicating whether or not the message has been read. Acommunications message may organize message data and metadata using astructured format, including identifying message data and metadata in astructured format such as extensible markup language (XML). A commandmessage includes one or more instructions for a recipient device toexecute. In one configuration, a mobile messenger receives commandmessages and is configured to take various actions in response to thecontents of the command message. Command messages may also conveyconfiguration information, software updates, and other data used tooperate the recipient device.

The terms “gateway” and “portal” as used interchangeably herein to referto a computing server that is operatively connected to a computingdevice, often referred to as a “backend” computing device, and to anetwork. The gateway provides a translation service that enables one ormore client computing devices that are operatively connected to thenetwork to access the backend computing device. A web gateway or webportal is an example of a gateway that enables client computing devicesto access the backend service using a web browser. Alternative gatewaysenable clients using different communications methods such as email,simple messaging service (SMS), secure shell (SSH), telnet, webservices, and the like to access the backend computing device. Gatewaysand portals may be configured to enable clients to send commands tocontrol the backend computing device, and to receive data from thebackend computing device.

A schematic block diagram of an example of an improved mobile messenger100 is depicted in FIG. 1. A controller 104 is communicatively connectedto a display 108, one or more input devices 112, one or more wirelesstransceivers 116, an input/output (I/O) interface 128 for reading andwriting data, a speaker 152, headphone jack 148, and vibration mechanism144. Display 108 is typically a screen small enough to be housed withina hand-held mobile electronic device. Display 108 may be capable ofdisplaying text and graphics in color as well as monochrome, and mayalso be configured to emit light to make the display contents visiblewhen there is little or no ambient light around the device. Display 108outputs text or graphical data in response to signals generated by thecontroller 104. At least one input device 112 within the mobilemessenger 100 permits the user to communicate with and send commands tothe controller 104. The input device may include a physical key inputsuch as a numeric keypad or a QWERTY keyboard. Other input devicesinclude touch pads, joystick devices, and trackballs. The display 108may be configured as touch-screen input device enabling a user to sendinput to the controller by touching the screen with one or more digitsor a stylus. An aural input device may also be used, including amicrophone to record spoken commands. Any compatible input deviceencodes input data in an electronic format capable of being decoded bythe controller 104. Various customization settings enable a user ofmobile messenger 100 to alter the appearance of messages shown indisplay 108 and to customize the operation of mobile messenger 100. Suchcustomizations include changing the colors and sizes of fonts forcommunications messages shown in display 108, selecting themes forvarious elements of the graphical display, and in selecting alternativealert sounds.

Controller 104 is also connected to one or more wireless transceivers116 that are capable of selecting between at least two wirelesssignaling protocols. The transceivers 116 permit controller 104 to sendand receive data over different wireless networks, and also permitcontroller 104 to receive command messages sent from another device orserver connected to one of the wireless networks. Controller 104 isadditionally configured to implement a compressor and decompressor tocompress and decompress data sent and received via the transceivers 116.The compressor and decompressor may be implemented in software read fromsystem storage 136 and executed by the controller 104, or may beimplemented as hardware circuits in the controller 104. The compressoris configured to compress seed data read from the system storage 136prior to compressing network data, and the decompressor may optionallydecompress the compressed seed data prior to receiving compressednetwork data. The compressor compresses data that is transmitted usingthe wireless transceivers 116, and the decompressor decompressespreviously compressed data received from a control system and othercomputing devices via the network wireless transceivers 116. Twoexamples of compression techniques suitable for the compressor anddecompressor are the DEFLATE and LZW techniques, although othercompression and decompression techniques may be used.

In various embodiments, a mobile messenger may use two or more wirelesstransceiver modules, with each module configured to use a separatecommunications protocol. These protocols may use different operatingfrequencies and modulation schemes. In the example of transceivers 116,one transceiver module 118 is configured to operate using WLAN networksemploying the IEEE 802.11 family of protocols, while another modulartransceiver 120 supports WWAN networks, such as a 3G or 4G network.Examples of 3G data networks include EV-DO and UMTS, while examples of4G data networks include LTE and WiMAX. Upon establishing a connectionwith either a WLAN or WWAN, the controller is assigned a networkaddress, typically an Internet Protocol (IP) address using eitherversion 4 (IPv4) or version 6 (IPv6) of the IP standard. Alternativeembodiments to wireless transceivers 116 could use software-definedradio systems to enable a single physical transceiver to operate withdifferent frequency bands using different signaling protocols. Forexample, a single physical transceiver using a software-defined schemecould switch between operation in 802.11 mode or WWAN mode in responseto commands sent from the controller 104. The transceivers 116 areelectrically connected to an antenna 124. In order to save space in themobile messenger 100, a single antenna 124 may be configured to becompatible with both the 802.11 transceiver 118 and WWAN transceiver120. However, alternative devices may employ multiple antennae adaptedfor use with one or more transceivers. Antenna 124 may be replaced by alight-emitter and lenses for alternative transceivers that operate inthe infra-red or optical portion of the electromagnetic spectrum.

Continuing to refer to FIG. 1, controller 104 is communicatively coupledto a data input-output (I/O) interface 128. In mobile messenger 100, theI/O interface 128 is a shared electronic bus that operationally connectscontroller 104 to random access memory (RAM) 132, a data storage deviceholding operating software 136, and a digital storage device holdingmessage and user data 140. Alternative I/O interfaces may includepoint-to-point or switched I/O schemes to facilitate communicationbetween controller 104 and one or more memory and storage devices. RAM132 holds command instructions and operating data used by controller 104during normal operations. RAM 132 is typically volatile, meaning thatwhen electrical power is removed from the device, the contents of dataheld in the RAM are erased. System storage 136 holds the stores machinereadable instructions for one or more programs that controller 104 mayread to receive instructions used for various operations of mobilemessenger 100. In some embodiments, system storage 136 may also holdoperating instructions use to configure other system componentsincluding the wireless transceivers 116. The system storage 136 istypically stored in a non-volatile storage device such as a NAND or NORflash device, allowing the instruction codes held in system storage 136to be re-read after electrical power is removed from the mobilemessenger 100. The data contents of system storage 136 may be referredto as “firmware” because they are not supposed to be altered duringnormal operation, but may be updated periodically to allow for updatesto the operating commands used in the mobile messenger 100. Data storagedevice 140 stores sent and received communications messages and otheruser information used by mobile messenger 100. User information includesuser customization settings that are stored in an XML data record formatin the embodiment of FIG. 1. Data storage device 140 allows for accessto previously received communications messages without the need toretransmit those messages over a wireless network. Like system storagedevice 136, data storage device 140 is typically a non-volatile devicefor the long-term retention of user data. However, the data storage 140is configured to have stored data read, written, and erased bycontroller 104 during normal use of the mobile messenger 100. The datastorage device 140 and system storage device 136 may optionally beplaced in logically separated areas of a single physical device.

Controller 104 is optionally connected to one or more audio, visual, orvibrational indicator devices. These devices may emit sounds, producevibrations, or provide visual cues providing feedback to the user aboutthe status of the device. Audio outputs including a built-in speaker 152and head phone output 148 may provide audible alerts when a new messageis received, and may be configured to play back audio messages. Audiooutputs may have an adjustable volume level that may change in responseto control signals sent by controller 104. A vibration mechanism 144,may vibrate in addition to, or instead of, an audible alert sounding.Common vibrational mechanisms employ a small electrical motor with arotating axle connected to a weight that is shifted off-center of therotational axis of the axle. One or more indicator lights 156 may alsoactivate or blink in a pattern to communicate device status. The lightsmay be of different colors to provide more information. For example, ared light may indicate a high-priority message has been received, whilea green light may indicate a normal-priority message has been received.

In operation, mobile messenger 100 is configured to establish aconnection to an available wireless network using either the WLANnetwork transceiver 118 or WWAN network transceiver 120. In situationswhere multiple wireless networks are available, controller 104 isconfigured to select one of the available networks automatically basedon a predetermined list of prioritized networks read from system storage136. The mobile messenger obtains a network address from either the WLANor WWAN, where the network address is typically an IP address. Thecontroller is further configured to send authorization data over thewireless network, with the authorization data may include a deviceidentifier corresponding to the mobile messenger and a username andpassword combination entered by the user via one of the input devices112, such as a keyboard. If the authorization succeeds, the controllersends and receives communications messages using wireless transceivers116. Communications messages are sent and received from a centralmessaging server having a unique network address such as an IP address.Communications messages to and from other mobile messengers or othernetworked devices are all directed to the central messaging server priorto final message delivery. Received messages are stored in the datastorage device 140 and are shown on display 108. Controller 104 isconfigured to send a receipt message over the wireless networkconnection in response to receiving a communications message. A user mayread the contents of a received message on display 108, or may listen toaudio messages via speaker 152 through head phone interface 148. Inresponse to the user reading a communications message, controller 104 isfurther configured to send a message indicating that the communicationsmessage has been read over the wireless network. A user may also entermessages for transmission via the input devices 112. After a message issent, the mobile messenger 100 may receive one or more status messagesindicating that sent message has been received and that it has beenread. Controller 104 is further configured to inform the user of thestatus of sent messages via the display 108.

Mobile messenger 100 is further configured to receive and take action inresponse to command messages that are sent over a wireless network froma central command site. Controller 104 may receive a command messageinstructing it to adjust the volume of audio outputs such as speaker 152and head phone output 148. This command may be sent in order toautomatically mute audio output automatically, without requiring theuser to adjust the volume level manually. Conversely, a differentcommand message may instruct controller 104 to adjust the audio outputto a higher volume level and output an alarm sound. This operationalmode is useful when a mobile messenger is misplaced and an alarm soundsto help locate the device. The controller may override the pre-set audiovolume level to ensure that an alarm is audible. A related commandmessage may instruct the controller 104 to lock the mobile messenger.Unlike a user-lock that requires the user to enter a code to unlock thedevice, the device may be enabled for use only by another commandmessage generated by an administrator using the control system. Stillanother command message instructs controller 104 to delete the contentsof data storage device 140. This command is useful if mobile messenger100 is lost, stolen, or is to be reset in order to eliminate thecontents of any potentially sensitive communications from data storagedevice 140. This command also deletes any stored authentication datasuch as username and password information, preventing unauthorized usersfrom sending or receiving messages with mobile messenger 100. Anothertype of command from a central control site may include command messagesthat instruct the controller of the receiving device to enable ordisable one or more of the wireless transceivers in the receivingdevice.

A control system 200 suitable for administering one or more of themobile messengers described in FIG. 1 is shown in FIG. 2. Control system200 includes an administration server 204, authentication authority 206,messaging server 208, user database 212 (abbreviated as DB in FIG. 2),and message database 216. Administration server 204 is configured toread and write data from user database 212, message database 216. Theserver 204 is further configured to send communications message data tomessaging server 208, to send command messages to one or more mobilemessengers 232A-232D, and to send and receive administration data with aremote administration host 240A and 240B. Authentication authority 206is configured to read user identity and authentication data from userdatabase 212, and to update user database 212 with status information ofwhether a user is authenticated and actively connected to the controlsystem 200. Messaging server 208 is configured to send, receive, andstore communications messages sent to or from one or more mobilemessengers 232A-232D. Messaging server 208 is further configured tostore communications messages in message database 216.

Control system 200 is communicatively connected to at least one datanetwork. In FIG. 2, control system 200 is communicatively coupled to aWide Area Network (WAN) 220 and Local Area Network (LAN) 222. WAN 220and LAN 222 convey electronic data between control system 200 and one ormore mobile messengers 232A-232D. LAN 222 may be a network combiningwired Ethernet with a wireless networking technology, such as an 802.11network. The Internet is an example of a network suited for use as aWAN. The mobile messengers access WAN 220 and LAN 222 via one or morewireless communications systems. In FIG. 2, 802.11 wireless access point226 connects mobile messenger 232A to LAN 222, while a different 802.11access point 224 connects mobile messengers 232B and 232D to WAN 220. AWWAN wireless tower 228 connects mobile messenger 232C to WAN 220 andcontrol system 200. Control system 200 is configured to send and receivecommunications messages sent and received from the mobile messengers232A-232D, by directing communications messages to and from the networkaddress, typically IP addresses, associated with each mobile messenger.Control system 200 may communicate with computing systems other thanmobile messengers 232A-232D. In FIG. 2, computers 240A and 240B areconfigured to access administrative information via administrationserver 204. Additionally, a third-party smartphone 236 is able to sendand receive communications messages with messaging server 208. Otherexamples of third party devices that may exchange communicationsmessages with control system 200 include desktop and notebook computers,telephones configured to send voice messages in a digital formatincluding Voice over Internet Protocol (VoIP), and two-way pagers.

User database 212 and message database 216 provide a system for storingand retrieving user data and message data respectively. Each of thesedatabases may be implemented using various data organization methodsincluding a relational database model, object-oriented data store, flatfiles including comma-separated value files and the like, andhierarchical data models including records stored with an ExtensibleMarkup Language (XML) scheme. The user database 212 stores directoryinformation pertaining to each user of the system. This informationincludes authentication data such as a username and password, and statusinformation indicating whether the user is presently using a mobilemessenger that is connected to a wireless network. The user database 212includes an identifier to associate the user with one or more mobilemessengers. The identifier may be a hardware address associated with aparticular mobile messenger such as a Media Access Control (MAC)address.

The user database 212 may include additional information, such asaddress book information having addresses of other parties with whom theuser communicates. User database 212 also stores pager group recordsthat associate multiple user addresses and device identifiers with asingle paging group. A paging group refers to a predefined group ofusers that receive a common message or page sent by one user oradministrator. The user database 212 provides address information to themessaging server 208 to enable the messaging server 208 to send messagesto each user identified in the pager group record when a message is sentto the pager group. Customized user settings applicable to a particularmobile messenger device held in an XML formatted record are also storedin user database 212. The customized settings pertain to customizationsapplied by the user to each device, including font sizes and colors,graphical interface themes, and alerts such as custom alert sounds. Thesetting records are generated by each mobile messenger, and are thentransmitted via either WAN 220 or LAN 200 for storage in the directoryentry for the corresponding user. Message database 216 is an archive ofcommunications messages sent and received from each of the mobilemessengers. This database may include messages that have already beensent by or delivered to a recipient. Message database 216 may also holdmessages that have not been sent to a mobile messenger for variousreasons including the mobile messenger being out of range of a suitablewireless network. When the mobile messenger becomes available, thestored messages are automatically transmitted to the mobile messenger bymessaging server 208. Message database 216 additionally holds metadataassociated with each communications message. These metadata includeidentifiers for the party sending the message and the intendedrecipient, and a timestamp for when the message was stored in messagedatabase 216. Metadata further include status codes and timestampsindicating when and if a communications message was received by a mobilemessenger, and whether or not the user of the mobile messenger hasdisplayed the message.

Authentication authority 206 provides authentication and access controlservices for mobile messengers 232A-232D and for administrators thataccess the administration server 204 via computing devices 240A and240B. When a mobile messenger establishes a wireless network connection,it sends authentication data to control system 200. The authenticationdata may include a username and password to establish the identity ofthe user operating the mobile messenger. The authentication informationmay additionally include information useful for determining the locationof the mobile messenger. Such information may include a hardware addressassociated with a wireless access point such as access point 226 or WWANtower 228. The information may further include geographic coordinatessuch as latitude and longitude coordinates obtained from a GlobalPositioning System (GPS) device included with the mobile messenger.Additionally, the network address, such as an Internet Protocol (IP)address, assigned to a connected mobile messenger may indicate theapproximate location of the mobile messenger. Upon receipt ofauthentication information, authentication authority 206 compares theprovided authentication information with information stored in userdatabase 212. If the authentication information is valid, such as ausername and password matching a username and password stored in theuser directory, then the authentication authority updates statusinformation held in the user directory to indicate that the user isconnected, and the network address to which communications and commandmessages should be sent. Authentication authority 206 may update userdatabase 212 with additional information sent from the authenticatedmobile messenger including the time of when the device wasauthenticated, the IP or other network address currently assigned to themobile messenger, and any location information as discussed above. Theauthentication process may be repeated when the mobile messengerestablishes a connection with a different wireless network.

Administration server 204 provides an administrative interface, orportal, allowing one or more administrator users to view or modify dataheld in user database 212 and message database 216. One embodiment of aportal is a web server that enables administrators to access theadministrative interface using compatible client software on remotecomputing devices. As used herein, any administrative action or commandrefers a human administrator submitting a request to the administrationserver 204 via the administrative interface using a computing devicesuch as devices 240A and 240B, or any of mobile messengers 232A-232D.The control system 200 receives the request in the form of one or moredata messages via WAN 220 or LAN 222, and one more software programs inthe administration server 204 execute actions in response to therequest. As described below, one or more software programs in theauthentication authority 206 may prevent administration server 204 fromexecuting a request if the administrator who submitted the request lacksauthority to make the request. In the example of FIG. 2, administrationserver 204 implements a web server that provides a portal administrativeinterface for administrators to access remotely via WAN 220 or LAN 222using a standard web-browser from a remote administration host such ascomputing systems 240A and 240B. In embodiments of mobile messengersthat include a web browser or other remote access software, one or moreof the mobile messengers 232A-232D may also access administration server204. In alternative embodiments the gateway may include alternativegateway and portal services including SMS portals, email portals, andany other gateway service that is adapted for use with client computingdevices including the mobile messenger devices. The portal enablesadministrator users to view, add, revise, or remove user informationfrom user database 212. This ability includes displaying the status ofall known users to determine if each user has a mobile messenger that ismaintaining an active wireless network connection with control system200. The portal also enables administrators to view communicationsmessages held in the message database 216, including status informationas to whether a message has been received or read by one or morerecipients. Administration server 204 also permits an administrator tosend communications to a group of multiple mobile messengers. Forexample, an administrator may send a broadcast message to all mobilemessengers. Administration server 204 passes the broadcastcommunications message to messaging server 208 which then sends thecommunications message to each of mobile messengers 232A-232D.

Administration server 204 is additionally configured to receive requestsfrom an administrator to send command messages to one or more of themobile messengers 232A-232D. A command message is a data message thatinstructs a mobile messenger to take an action in response to thecommand. As described in more detail below, various command messages mayinform a mobile messenger to take actions including emitting an alarmsound or deleting stored message data. In response to an administratorrequesting an action for the device of a particular user, administrationserver 204 determines the network address of a device belonging to theuser from the user database 212 and sends the appropriate commandmessage. Administration server 204 may also send commands messagesautomatically in response to predefined events occurring. An example ofsuch a predefined event is sending a command to set the volume level ofaudio output of a mobile messenger to mute in response to the mobilemessenger sending location information indicating it is in apredetermined location.

The authentication authority 206 may limit access to the command system200 for different administrator accounts. For example, a subset ofadministrator accounts may have full access to all functions of thecontrol system 200, including the ability to establish accounts andchange permissions for other administrator accounts. The remainingadministrator accounts have selective permission to manage variousfunctions including the control of mobile messenger devices, permissionto send high-priority pages to groups of mobile messenger devices, andpermissions to review reporting information stored in the control systemfor one or more mobile messenger devices. The administrator accountswith limited access may also be restricted to administration of a subsetof the mobile messengers. For example, a medical administrator may havepermission to send group pages to all medical staff in a singledepartment of a hospital, but not to other departments. Anotheradministrator may have permission to update a published address booklist for medical staff in the emergency room, but not for other addressbook lists.

Authentication authority 206 permits or denies administrator commandsusing a role based access control (RBAC) system. The RBAC systemassociates each administrator account with one or more roles. Each roledefines a set of permitted operations that an administrator with therole may make, and a set of objects upon which the permitted operationmay act. For example, the aforementioned medical administrator has arole that enables the operation of sending group pages, and the rolefurther limits paging operation to the paging group of staff associatedwith the administrator. This role permits the group page operation, andlimits the operation to a predetermined set of objects, where therelevant objects are the paging groups. A single administrator may haveone or more roles that grant various permissions to access functions inthe administration server 204.

In control system 200, administrators with a senior administrator rolemay have permission to establish and revise roles, establish newadministrator accounts, and to associate each administrator account withone or more roles. Each role may be stored as a record in the userdatabase 212 for use by the authentication authority 212 in authorizingone or more operations that authentication server 204 executes inresponse to commands received from administrators. When control system200 receives a new request submitted by an administrator, theauthentication authority 206 identifies the roles corresponding to theadministrator and then identifies whether the roles permit theoperations and objects specified in the request. If the request ispermitted, administration server 204 executes the request. If therequest is not permitted, the administration server 204 does not executethe request and the authentication authority 206 may generate a recordof the request and store the record in the user database 212 forauditing purposes. While control system 200 is shown implementing anRBAC system, various other access control techniques including mandatoryaccess controls, discretionary access controls, and lattice-based accesscontrols may be employed to define permissions for each administrator.

Messaging server 208 sends and receives communications messages sent toor from one or more mobile messengers 232A-232D. All communicationsmessages sent by a mobile messenger or intended for a mobile messengerare directed to messaging server 208 prior to final delivery to theintended recipient. When a new communications message is received,mobile server 208 stores the message and associated metadata in messagedatabase 216. Messaging server 208 is configured to determine theintended recipient of the communications message, and if the recipientis another mobile messenger, the communications message is sent to therecipient device if that device is available to receive communicationsmessages in user database 212. Messaging server 208 may queue unsentmessages until such time as the intended recipient mobile messengersbecomes available to receive messages. Messaging server 208 is alsoconfigured to transmit archived communications message data and otheruser data to a mobile messenger, even when the transmitted messages mayhave been previously delivered. These transmissions may occur when anexisting user registers a new mobile messenger by providingauthentication information to authentication authority 206. Messagingserver 208 sends the archived message content to the newly registeredmobile messenger so no communications messages are lost when a userregisters a new device.

Messaging server 208 is further configured to transmit communicationsmessages between mobile messengers 232A-232D and various third-partynetworked devices such as smartphone 236. Such functionality is known asinterworking or internetworking. Messaging server 208 may convertbetween different communications protocols to facilitate messagedelivery. For example, if smartphone 236 sends an SMS text message tomobile messenger 232A, messaging server 208 may extract the contents ofthe text message, and re-encode the message using an alternativeprotocol such as the Extensible Messaging and Presence Protocol (XMPP)instant messaging protocol. Similarly, a reply message send from mobilemessenger 232A to smartphone 236 may be sent using XMPP, and messagingserver 208 may be configured to re-encode the message in SMS or in athird message protocol such as an email. To facilitate thisinteroperability, user database 212 may include alternative aliasesidentifying each user including one or more email addresses, phonenumbers, or instant messenger screen names.

In operation, the mobile messengers 232A-232D and control system 200 maysend and receive command messages, communications messages, and variousdata including address book and configuration data using apublisher-subscriber, or “pubsub” communications model. An example of anexisting pubsub protocol is the XEP-0060 Publish-Subscribe extension tothe XMPP protocol. Using the XMPP protocol or any other pubsub scheme,an efficient transmission of communication of data, includingauthentication, communication, and command messages, reduces operatingcosts and improves network performance. In some pubsub models, publishedinformation may be distributed in a multicast manner such that publishedinformation may be sent to multiple subscribers without the need toretransmit published information for each of the subscribers. Existingpubsub models operate on a “best effort” basis that attempts to deliverpublished data, but provides no guarantee that subscribers receive thedata and generate no record indicating whether a particular subscriberreceived published data. To improve reliability over existing pubsubsystems, the embodiments disclosed herein are implemented to ensure thatpublished data is quickly and reliably transmitted to the subscribersautomatically.

In the embodiment of FIG. 2, a publisher node, or publisher, makesavailable or “publishes” data that one or more subscriber nodes mayselectively receive via a subscription. The subscriber node, orsubscriber, establishes a “subscription” with the publisher node tosubscribe to some or all of data that the publisher node publishes. Asused herein, configuring a subscription refers to a configuration wherea subscriber node is registered with the publisher node to receivepublished data. The subscriber device may send a message to thepublisher node to configure the subscription, or a third party such asan administrator may preconfigure the subscription in both the publishernode and subscriber node. Once a subscription is established, publisheddata may be sent to the subscriber nodes using either or both of a“pull” model where the subscriber may request published content and a“push” model where the publisher initiates transmission of updates topublished data to subscribers. In the embodiment disclosed herein, thepublisher node maintains a record that identifies the computing deviceassociated with each subscriber node and the publishing nodes with whichthe subscriber node has established a subscription. Additionally, eachpublished node contains a version number which is incremented each timenew data is published. A version number is an integer or any identifierthat may be incremented and compared to other version numbers toidentify the order in which data messages are generated. Each subscribermaintains the version number for the last received update for eachsubscribed node. Using the version number, the subscriber can filterstale or out of order receipts of update messages by comparing theversion in the received message to the highest version number yetreceived. If the version number is less than or equal to the highestversion number seen, then the message is stale and may be ignored by thesubscriber.

In operation, control system 200 establishes one or more defaultsubscriptions for each of the mobile messengers 232A-232D to enable themobile messengers to receive communications and command messages. Themobile messengers 232A-232D may subscribe to published informationprovided by control system 200 to access resources including addressbooks or paging groups. Authentication authority 206 may control accessto limit the publication nodes that each mobile messenger may subscribeto in accordance with access control rules stored in the user database212. Each mobile messenger 232A-232D may also establish one or morepublisher nodes, with the control system 200 acting as a subscriber toreceive published information including monitor and report datagenerated by each mobile device.

Control system 200 and mobile messengers 232A-232D are configured toguarantee either that subscriber nodes receive published data, or that arecord is generated to indicate that a subscriber cannot receive themessage. FIG. 16 depicts a process 1600 for guaranteed message deliveryin a pubsub system. A publisher node generates data to be published andstores the data in a cache (block 1604). Examples of published datainclude communications messages and command messages that the controlsystem publishes for one or more mobile messenger subscribers. The cachemay be an internal memory, such as the data storage 140 in a mobilemessenger, a database, such as user database 212, and message database216 in the control system 200, or any data storage device that isconfigured to hold the published message data. The cache may alsoinclude the version number associated with each message for each of thesubscribers.

When publishing data, a publisher node makes the data available to allsubscribers and updates a version number associated with each subscriberthat has a subscription for the published data. (block 1608). Theversion number is associated with published data and one subscriber tothe published data. The publisher node has a record of the newestversion number associated with each subscriber, and the publisherincrements the version number each time new data are published. In thesystem of FIG. 2, the control system 200 may store the newest versionnumbers for each mobile messenger device in user database 212. Thesubscriber stores a version number corresponding to the most recent datathat the subscriber received from the publisher, and the subscriber mayreceive new data having more recent version numbers than the storedversion number. Since multiple subscribers may subscribe to a singlepublisher node, the publisher node may generate version numberscorresponding to each subscriber. Since each subscriber may subscribe tomultiple publishers, each subscriber may store a version numbercorresponding to each publisher.

In process 1600, the subscriber receives published data having versionnumbers newer than the version number corresponding to data previouslyreceived from the publisher (block 1612). In response to receiving thepublished data, the subscriber node sends a receipt message (block1616), also referred to as an acknowledgement message, to the publisher.The receipt message may include a checksum, message digest, or othermessage verification data to confirm that the subscriber received thepublished data without any corruption or data errors. If the receiptmessage indicates the subscriber received the data successfully (block1620), then the publisher marks the published data as received (block1624). Data messages marked as received by all subscribers may beremoved from the cache. The subscriber updates the version number ofpublished data that the subscriber node has received to the newestversion number of the message data received from the publisher node(block 1628). In the event of failed message delivery (block 1620), thepublisher node may attempt to send the published data to a subscriberone or more times (block 1612). In long-term failure modes where asubscriber is unable to receive data after predetermined period of timeor predetermined number of attempts to receive the published data (block1632), the publisher may generate a record of the error and log theerror record to inform administrators which subscribers failed toreceive the message (block 1636).

Certain categories of messages, including system status messages,configuration messages, and software updates may supersede earliermessages of the same type. For example, a first command messageinforming mobile messengers of approved wireless access point SSIDs maybe superseded by an updated list of SSIDs. To minimize the number ofunneeded update messages sent to subscribers in the event that asubscriber is offline when an earlier message is published, thepublisher maintains a link between the cached published data and thesubscriber. When the publisher generates new message data for asubscriber, the publisher checks the previously published message datato determine if the subscriber has acknowledged receipt of thepreviously published data. If the previously published data have not yetbeen received by the subscriber, then the cached previously publisheddata are evicted before inserting the updated published data into thecache. Thus, when a subscriber is unavailable for an extended period oftime, the publisher node only provides the most recent update messagesfor the subscriber.

Control system 200 may include various hardware and software componentsthat implement the administration server 204, authentication authority206, messaging server 208, user database 212, and message database 216.FIG. 3A depicts one embodiment of the control system 200 shown as asingle computing device such as a commercially available server thatincludes a processor 252, volatile memory such as RAM 262, non-volatileelectronic data storage including magnetic drives, optical drives, andsolid state devices 254, and one or more network interfaces 264. In thisembodiment, the non-volatile data storage 254 stores machine readableinstructions for one or more software programs in program data 256 thatthe processor 252 reads and executes to implement the functions of theadministration server 204, authentication authority 206, messagingserver 208, user database 212, and message database 216. Thenon-volatile data storage also stores data in the user database 212 andmessage database 216. The processor may read and write to thesedatabases in accordance with the operations of the administration server204, authentication authority 206, and messaging server 208. Networkinterface 264 sends and receives communications messages, commandmessages, and network traffic associated with administrators accessingthe administration server 204. Network interface 264 may include one ormore network communications devices such as wired Ethernet adapters,wireless network devices, and any networking devices that enable thecontrol system 200 to send and receive data via WAN 220 and LAN 222.Processor 252 and network interface 264 are additionally configured toimplement a compressor and decompressor to compress and decompress datasent and received via network interface 264. The compressor anddecompressor may be implemented in software read from program data 256and executed by the processor 252, or may be implemented as a hardwarecompressor and decompressor in the network interface 264. The compressoris configured to compress seed data read from the program data 256 priorto compressing network data, and the decompressor may optionallydecompress the compressed seed data prior to receiving compressednetwork data. The compressor compresses data that is transmitted usingthe network interface 264, and the decompressor decompresses previouslycompressed data received from mobile messengers and other computingdevices via the network interface 264. Two examples of compressiontechniques suitable for the compressor and decompressor are the DEFLATEand LZW techniques, although other compression and decompressiontechniques may be used.

FIG. 3B depicts an alternative embodiment in which control system 200includes multiple computing devices that are configured to operatetogether to perform the functions of the control system 200. A firstcomputing device 266 is configured to store the user database 212 andmessage database 216, while a second computing device 268 stores programdata to implement the administration server 204, authenticationauthority 206, and messaging server 208. The first computing device 266includes a process 270, RAM 272, and non-volatile data storage 274. Thenon-volatile data storage 274 holds program data volume 276, the userdatabase 212, and message database 216. Processor 270 reads and executesmachine readable instructions stored in the program data 276 toimplement the functions of user database 212 and message database 216.The second computing device 268 includes a processor 278, RAM 280,non-volatile storage 282, and network interface 264. Non-volatilestorage 282 stores program data 284 that includes machine readableinstructions for one or more software programs that the process 278reads and executes to implement the functions of the administrationserver 204, authentication authority 206, and messaging server 208. Theprocessor 270 and network interface 264 may implement a compressor anddecompressor as described above with reference to FIG. 3A. The firstcomputing device 266 and second computing device 268 are operativelyconnected through an input/output (I/O) channel 286. The I/O channel 286enables the administration server 205, authentication authority 206, andmessaging server 208 implemented on the first computing device 268 toaccess the user database 212 and message database 216. The I/O channel286 may be any communications channel suitable for operating the controlsystem. Typical I/O channels include network connections establishedthrough local or wide area networks, as well as serial, switched, andparallel data communications channels.

The mobile messenger 100 of FIG. 1 is another example of a device thatmay serve as control system 200. Controller 104 reads and executesmachine readable instructions held in system storage 136 that implementone or more software programs for the administration server 204,authentication authority 206, messaging server 208, user database 212,and message database 216. The user database 212 and message database 216may be held in data storage device 140 to enable controller 104 to readand write to both databases. An administrator may access theadministration server directly via command software through a standardweb browser on a computer or through an application programminginterface into another console application running on a computer or amobile device. This alternative embodiment may be particularly usefulwhen a temporary network of mobile messengers is established in a remotelocation such as a field hospital or emergency command post.

The foregoing embodiments of control system 200 are merely examples ofsuitable control system configurations. Alternative embodiments ofcontrol system 200 may employ various software and hardwareconfigurations known to the art including virtualization and clusteringto implement the functions described herein.

A front view of the exterior of an example mobile messenger 300 isdepicted in FIG. 4. Housing 304 encloses the internal componentsdiscussed in FIG. 1, including a controller, wireless transceivers, anddata storage devices. Housing 304 in example device 300 of FIG. 4 alsoencloses an antenna, but alternative embodiments may place a portion orthe entire antenna externally of the housing. A keyboard 308 is disposedin the front of housing 304. The example keyboard 308 uses a QWERTY keyarrangement. Alternative input devices including simplified key pads,touch pads, directional keys, and the like may also be employed inalternative embodiments. A display 312 is placed above keyboard 308.Display 312 is configured to show text and graphics received incommunications messages, and is capable of displaying multiple colors.As shown in FIG. 4, display 312 uses a Liquid Crystal Display (LCD)panel including arrays of red, green, and blue (RGB) pixels that may beselectively activated to display multi-colored content. Alternativecolors may be employed to distinguish various communications messagesshown on display 312. For example, display 312 may be configured todisplay messages that are classified as being high-priority using a redcolor. Alternative display technologies adapted for mobile electronicdevices such as Organic LED (OLED) displays may also be used for display312. While display 312 in FIG. 4 displays message data, alternativeembodiments may employ touch-screen displays that both display messagedata and accept user input. A speaker 316 is configured to emit audiblealerts and to play audio content for communications messages thatinclude audio content. Speaker 316 may have its volume level adjustedhigher or lower by buttons 320 and 324, respectively. Speaker 316 mayadditionally have its volume level adjusted by the controller inresponse to command messages or detection of predetermined conditionswithout using manual actuators, such as buttons 320 or 324. An indicatorlight 328 may provide visual feedback indicating that mobile messenger300 has received a new communications message, or to indicate anoperating state such as a light indicating that a network connectionwith a wireless network is established. Indicator light 300 may includea plurality of light elements such as a plurality of light emittingdiodes (LEDs) that emit various colors to provide various notifications.A power button 332 is disposed on housing 304 to enable the end user toactivate and deactivate the mobile messenger 300.

The mobile messenger 300 of FIG. 4 is merely one example of a mobileelectronic communications device that is suitable for use with thesystem of FIG. 2. Numerous alternative embodiments are envisioned usingmodified hardware components. Additionally, certain smartphone devicesmay be reconfigured as mobile messengers like mobile messenger 300 usingsoftware stored in a portion of the smartphone's memory. This softwaremay replace the original functionality of the smartphone with thefunctionality described herein, or the software may augment the normaloperations of the smartphone. This reconfiguration enables owners ofexisting mobile electronic communications devices to interoperate withthe system of FIG. 2 without the need to replace the existing devices.

A process 500 suitable for configuring the mobile messenger of FIG. 1 tooperate with the control system of FIG. 2 is depicted in FIG. 5. First,if a new user is being added to the user database in the control system,an administrator updates the user database with the user's name andpassword (block 504). The mobile messenger then establishes a networkconnection to a wireless network (block 508). This connection isestablished automatically, and the mobile messenger may select a singlenetwork to join from a plurality of networks as discussed in more detailbelow. Once connected to the wireless network, the mobile messengerestablishes a session with the control system (block 512). The mobilemessenger and control system may be configured to use an authenticationprotocol, such as the Simple Authentication and Security Layer (SASL)protocol, that enables the mobile messenger to verify the authenticityof the control system that receives the authentication data, and thecontrol system is able to verify the authenticity of the mobilemessenger. The mobile messenger may require authentication informationsuch as a username and password to establish the session. In someembodiments, an administrator enters the authentication information oncewhen initializing the device and this information is not accessible tothe user of the mobile messenger. When the mobile messenger establishesa session for the first time, the control system stores an identifierprovided by each mobile messenger device in association with the useraccount that established the session. In the example of FIG. 2, theauthentication authority 206 stores an identifier corresponding to eachdevice, such as a hardware Media Access Control (MAC) address, inassociation with the user in user database 212.

In existing messaging systems including the XMPP messaging system, theclient and server exchange various information to establish a session.The server may inform the client of various features that the serversupports, and the client may send presence information to the server toinform other clients that a new client has established a session withthe server. In the embodiment of FIG. 5, the control system establishesa session with the mobile messenger (block 512) without sending a listof supported features to the mobile messenger. The control system andmobile messenger are both configured with a predetermined set offeatures, and omitting the redundant information reduces the amount ofnetwork traffic generated each time a session is established. Thecontrol system also suppresses the broadcast of presence informationcorresponding to a mobile messenger device when the mobile messengerdevice establishes a session with the server. This data suppression alsoreduces the amount of network traffic generated in response toestablishing a new session.

Process 500 uses the pubsub communications model described above toestablish default subscriptions and distribute directory information andarchive messages to a mobile messenger once the mobile messenger hasestablished a session (block 516). The archived message information isstored in the control system and is published for the mobile messengerto enable the mobile messenger to display communications messages sentprior to activating the mobile messenger. The directory information mayinclude address book entries for other users in the user database. Userdirectory information may also include paging groups that includepredefined groups of contacts. A paging group record identifies eachmember of the paging group and is stored in the directory information.Receipt of a paging group identifier enables the control system toretrieve the paging group record and determine each member in the group.Each paging group may include multiple recipients who receive pages orother messages from an administrator or user. For example, in a medicalsetting, all doctors in a single department of a hospital may belong toa paging group for sending and receiving messages to the group. Forexisting users, customization settings stored in the user databasedirectory may be downloaded to restore custom user interface settingsused in a different mobile messenger to the newly configured mobilemessenger. For a new user, any communications messages received prior toauthenticating the mobile messenger are received as well. For first-timeauthentication of a new mobile messenger, a hardware address unique tothe particular mobile messenger is stored in control system. The mobilemessenger is manufactured with a network address or a unique serialnumber that the control system associates with the account of the newuser. The mobile messenger also subscribes to published lists ofauthorized wireless networks, as well as lists of locations specifyingspecial operations modes (block 520). The authorized network listsspecify priorities that identify an order in which the wireless networksare to be used when more than one wireless network is available. Thelocation lists may also include lists of locations where the mobilemessenger should automatically adjust its volume level, and locationsknown as exclusion zones where the mobile messenger should deactivateone or more of its wireless transceivers. Updated versions of thenetwork and locations lists may be sent to the mobile messenger afterconfiguration process 500 is completed. The first time that the mobilemessenger establishes a session with the control system, the mobilemessenger receives a complete update of all the data and configurationparameters recited above. A mobile messenger that has been configuredpreviously may establish a new session when activated from a powereddown state or when the mobile messenger loses contact with a wirelessnetwork and then reconnects. A previously configured mobile messengeronly receives updated message data, directory data, and configurationdata that the mobile messenger has not received during a previoussession. Upon completion of process 500, the mobile messenger isconfigured to send and receive new communications messages (524).

FIG. 6 depicts an alternative process 600 suitable for configuring themobile messenger of FIG. 1 to operate with the control system of FIG. 2.In process 600, an administrator updates the user database with theuser's name and password (block 604). The mobile messenger thenestablishes a network connection to a wireless network (block 612). Thisconnection is established automatically, and the mobile messenger mayselect a single network to join from a plurality of networks asdiscussed in more detail below. In order to send and receivecommunications messages, the user must provide authenticationinformation, which may include a username and password (block 616). Inprocess 600, the end user of the mobile device enters the username andpassword in order to authenticate with the control system instead of orin addition to authenticating with the mobile messenger device. Afterentering the username and password, the authentication information issent to a server, such as the authentication authority in the controlsystem, and the control system executes an authentication process usingthe data (block 618).

In the event that authentication of the mobile messenger fails (block620), the user may be prompted to re-enter the username and password(block 616). The mobile messenger may be configured to limit the numberof unsuccessful authentication attempts that are permitted beforeauthentication succeeds. The example process 600 allows the user fourattempts to enter a valid username and password. Upon a fourth incorrectusername and password entry, too many unsuccessful authenticationattempts have been made (block 632). The mobile messenger is then locked(block 636) and may only be utilized after the messenger is unlocked bythe administrator. The locked mobile messenger may optionally send analert message to the control system, informing the administrator thatthe device is locked (block 640). The alert message may further includelocation information to aid in recovering potentially stolen devices.

In the event that the response message from the control system indicatesthat authentication succeeded (block 620), the mobile messenger may beconfigured to retain the authorization information so that the user willnot be required to re-enter the authorization each time the mobilemessenger establishes a connection with the control system. The mobilemessenger and control system establish a session (block 512) in the samemanner as described above in FIG. 5. The mobile messenger may thenreceive user directory and message data (block 516), configuration dataincluding network and location lists (block 520), and is configured tosend and receive communications messages (block 524) in the same manneras described in FIG. 5.

Upon completion of either process 500 or 600, the mobile messenger isconfigured to send and receive communications messages. The mobilemessenger may be configured to subscribe to various publisher nodes,including the control system 200, to receive messages directed to themobile messenger individually, and to paging groups that includemultiple mobile messenger devices. The mobile messenger may receivevarious communications messages having metadata that identify a prioritylevel for the received communications message. In one configuration,each communications message has one of four priority levels, denoted asP1, P2, P3, and P4. P1 messages are emergency or “mayday” messages thatreplace the display of any other message or user interface element on adisplay, such as display 108, until the user takes an action toacknowledge the message. Some embodiments may restrict the ability togenerate P1 priority messages to an administrator sending messages viathe control system, while other mobile messenger devices generatelower-priority messages. The mobile messenger may also generate soundand vibration to notify the user of the P1 priority message in responseto receiving the P1 priority message. The mobile messenger overridesuser-defined volume levels in the mobile messenger to make thisnotification more effective.

A P2 message has a lower priority than the P1 message. The P2 messagealso replaces the display of any other message or user interface elementon the display 108 until the user takes an action to acknowledge themessage. The mobile messenger may generate a sound or vibration inresponse to receiving a P2 message, but the P2 message does not overridethe user-defined volume settings for the mobile messenger. In mobilemessenger embodiments that include indicator lights, both P1 and P2messages may activate one or more indicator lights, and may blink thelights in various patterns to attract the attention of the mobilemessenger user. A mobile messenger user may generate and send P2messages to authorized paging groups and individual mobile messengers.If the mobile messenger is locked when a P1 or P2 message is received,the mobile messenger activates the display and immediately prompts theuser for an unlock code to display the message. Both P1 and P2 messagesmay be sent to a single user, or the message may be sent to a paginggroup selected from an address book for an administrator or user.

In order to acknowledge a P1 or P2 message, the user may enter a replyto the message using an input device such as a touch-screen or keyboard.For efficiency, the mobile messenger may display a list of predefinedresponses to the message, and one or more recipients may select aresponse to send from the list. The predefined responses may be includedwith the original communications message. For example, a P1 message mayinform recipients of a meeting. The predefined responses could include“Attending,” “Not attending,” and “Arriving late” as possible responses.The display presents these choices to a user, and the user must select aresponse to send before using the mobile device for any other function.The mobile messenger sends the response message, and messaging server208 receives all response messages and stores the responses in themessage database 216. Administrators and the party who sent the originalhigh-priority message may receive both the responses from individualrecipients and view aggregate statistics of the total number of messagerecipients and the number of recipients that have acknowledged themessage.

P3 messages are standard priority messages. These messages may generatea visual alert on the mobile messenger display to indicate receipt of anew message, but the message does not override the user interface, andthe user does not have to acknowledge the message to continue operatingthe mobile messenger. The received message list in the mobile messengerstores each P3 message for later review. The mobile messenger maygenerate an audible sound or vibrate in accordance with user definedsettings when a P3 priority message is received. A P3 priority messagemay optionally include a set of predefined responses, or the recipientmay enter a response using input devices such as keyboard 308. If themobile messenger receives a P3 message while locked, the messenger maygenerate an audible sound in accordance with user settings, but receiptof the message does not immediately cause the messenger to prompt for anunlock code to display the message.

P4 messages are the lowest priority messages, and administrators send P4messages to one mobile messenger or to a paging group. These messagesappear in the message list stored in the data storage device in eachmobile messenger, but the mobile messenger does not generate a visualalert or audible sound when a P4 priority message is received. P4priority messages are for general announcements, and a mobile messengeruser does not send communications messages to respond to a P4 prioritymessage.

The P1-P4 priority levels described above are merely exemplary of asystem for handling messages with various priority levels. Alternativeembodiments may include more or fewer priority levels, and the mobilemessenger may be configured to take various actions in response toreceiving messages of each priority level.

FIG. 7 depicts a process 700 for controlling access to the userinterface of a mobile messenger. A mobile messenger device may lockaccess to the user interface to prevent unauthorized use of the mobilemessenger. Process 700 begins by configuring the mobile messenger toauthenticate the user (block 704). In one embodiment, the mobilemessenger prompts the user to enter a password or other authenticationinformation using one of the input devices. The control system mayconfigure the mobile messenger to require that the user configure thedevice with a password. The mobile messenger may optionally transmit theauthentication information or data corresponding to the authenticationinformation, such as a password hash, to the control system where theauthentication information is associated with the user in the userdatabase. Passwords or “lock codes” are one example of authenticationdata, but various other authentication mechanisms including biometricidentification, security tokens, and multifactor authenticationtechniques may be used as well. During operation, the mobile messengerlocks the user interface (block 708). The mobile messenger may lock theuser interface after a predetermined period of inactivity, or inresponse to a user command to lock the user interface. When the useroperates an input device, the mobile messenger displays a prompt thatrequests authentication data, and the user enters the authenticationdata (block 712). In process 700, the controller in the mobile messengerdevice, such as controller 104, processes the authentication data andpermits or denies access to the user data in response to theauthentication data. This may be referred to as “local security” sincethe mobile messenger determines the validity of authentication datawithout sending or receiving data to the control system. If the userprovides the correct authentication data (block 716), the mobilemessenger unlocks and presents the user interface (block 720).

In the event that authentication of the mobile messenger fails (block716), the user may be prompted to enter the authentication data again(block 724). The mobile messenger may be configured to limit the numberof unsuccessful authentication attempts that are permitted beforeauthentication succeeds. The example process 700 allows the user fourattempts to enter a valid username and password, although fewer orgreater numbers of attempts may be permitted. Upon a fourth incorrectusername and password entry, too many unsuccessful authenticationattempts have been made (block 724). The mobile messenger is then locked(block 728), and the mobile messenger sends a notification message tothe control system indicating that the device has been locked (block732). The mobile messenger ignores further attempts to enterauthentication information when locked. An administrator with permissionto unlock the mobile messenger may receive the lock notification andpublish an unlock command message (block 736). The mobile messenger issubscribed to receive the unlock message (block 740) and unlocks afterreceiving the unlock command (block 720). In an alternative embodiment,the device prompts for the use to enter authentication data instead ofunlocking in response to receiving the unlock command.

A process 800 for establishing network connections between a mobilemessenger and multiple wireless networks is depicted in FIG. 8. Process800 begins by detecting one or more available wireless local areanetworks (WLANs) (block 804). Multiple WLANs may be available in asingle location. For example, an 802.11 transceiver may detect threedifferent access points corresponding to networks A, B, and C. The listof available networks is compared to the internal list of networks heldin the mobile messenger to determine if any of the available WLANs areauthorized for use by the mobile messenger. The mobile messenger firstsearches for an authorized WLAN that has a measured signal strengthgreater than a predetermined threshold for optimal signal strength(block 808). In the context of process 800, a measured signal strengthfor a WLAN device may be generated from a Receive Signal StrengthIndicator (RSSI) measurement produced by the WLAN transceiver. The RSSIis a numeric value that represents the relative signal strength of asignal received from a WLAN access point within a range havingpredetermined maximum and minimum numeric values. The measured signalstrength number may be represented as a percentage of the maximum RSSInumeric value. In one embodiment, the optimal signal strength thresholdis 40% of the maximum RSSI value. A WLAN with a signal strength at orabove the optimal threshold enables the mobile messenger to transmit andreceive communications messages more quickly, and enables the mobilemessenger's WLAN transceiver to operate at lower power levels. Themobile messenger connects to the authorized WLAN having the strongestsignal (block 836). Additionally, the WWAN transceiver in the mobilemessenger may also be deactivated if it was previously active. Thedeactivated WWAN may be placed in a “sleep” mode that uses a minimalamount of electrical energy while still allowing the WWAN transceiver tobe energized quickly if it is needed. Process 800 continues byperiodically checking the signal strength after the WLAN connection isestablished (block 840). As long as the signal strength for theauthorized WLAN remains at or above the optimal threshold, the wirelessconnection is maintained (block 844). If the signal strength drops belowthe optimal level, the WLAN connection may still remain active, but themobile messenger begins scanning for authorized WLANs having strongersignals (block 804). This scanning typically occurs in situations wherea mobile messenger is carried to a different section of a building afterconnecting to a wireless access point and the mobile messenger begins toscan for stronger authorized WLAN signals.

In the event no WLAN networks with signal strengths greater than theoptimal threshold are available (block 808), the mobile messenger maystill be able to connect to an authorized WLAN as long as the signalstrength available is above the minimum threshold needed to send andreceive communications messages reliably (block 812). If this conditionis detected, the mobile messenger connects to the WLAN with thestrongest available signal (block 848). In one embodiment, the minimumsignal strength threshold is 1% of the maximum RSSI signal strength, orany measured signal strength level that is sufficient to send andreceive data with the corresponding WLAN access point. In cases where aWLAN signal is not above the optimal threshold, but is still above theminimum threshold, a predefined intermediate signal strength thresholdknown as a marginal threshold may be stored in the mobile messenger.While a WLAN signal strength between the minimum threshold and marginalthreshold is strong enough to maintain a connection, the WLAN signal maybe lost if it does not grow stronger. In one embodiment, the marginalsignal strength threshold is 20% of the maximum RSSI signal strength. Ifthe WLAN signal is deemed to be beneath the marginal signal strengthlevel (block 852), the WWAN transceiver is brought out of sleep mode(block 856). While the WWAN transceiver is not actively sending orreceiving transmissions at this stage, the WWAN transceiver is primed tobegin scanning for authorized networks more quickly should the WLANconnection be lost. The WWAN transceiver remains in sleep mode when theWLAN signal strength meets or exceeds the marginal threshold. The mobilemessenger continues to scan for authorized WLANs with stronger signalsregardless of whether the WWAN transceiver is brought out of sleep mode(block 804).

In the event the no authorized WLAN has a signal strength above theoptimal threshold (block 808) or the minimum threshold (block 812), themobile messenger deactivates the WLAN transceiver to conserve electricalpower, and determines if the messenger is outside of any exclusion zonesthat prevent the use of the WWAN transceiver for communications (block816). Examples of possible exclusion zones may include locations nearelectronic equipment that is sensitive to the radio-frequency emissionsused by the WWAN transceiver. Common examples include certain forms ofmedical equipment and remote detonators used in explosive mining anddemolition. The mobile messenger has a predefined list of exclusion zonelocations stored in its memory, and the control system may send updatedlists of exclusion zone locations to the mobile messenger to add,remove, or change locations that are part of exclusion zones. When themobile messenger detects that it is in one of the predefined exclusionzones, it does not use the WWAN transceiver, but instead continues toscan for available WLAN signals (block 832). The mobile messenger maydetermine its location in a variety of ways including, but not limitedto, data acquired from a global positioning system (GPS) receiver in themobile messenger, or by estimating its position from the relative signalstrengths of one or more WLAN access-points having known locations, asdiscussed in more detail below.

In the event that the mobile messenger is outside of any exclusion zones(block 816), the WLAN transceiver is deactivated to minimize powerusage, and the WWAN transceiver is activated (block 820). The WWANtransceiver scans for one or more authorized WWANs available to transmitand receive communications messages (block 824). In the event that aWWAN is available, the mobile messenger connects to the WWAN (block828). While connected to the WWAN, the mobile messenger periodicallyactivates the WLAN transceiver to begin scanning for authorized WLANnetworks that may become available after establishing the WWANconnection (block 832). While scanning for WLAN networks, the mobilemessenger may identify available WLAN networks that are not present inthe authorized WLAN network list. When a non-authorized WLAN is detectedon multiple occasions and has a signal strength that exceeds the minimumsignal strength threshold, the mobile messenger may disconnect from theWWAN network and prompt the user to establish a manual connection to thedetected WLAN. The manual prompt includes a passphrase entry prompt ifthe WLAN requires a passphrase to establish a connection. The mobilemessenger may use the WLAN instead of the WWAN to conserve battery lifeand to reduce operating costs incurred from using WWAN networks. Tomaintain private communications when using manually connected WLANsystems, the mobile messenger may send and receive command andcommunications messages encrypted using various encryption schemesincluding the Secure Socket Layer (SSL) and Transport Layer Security(TLS) protocols.

In certain situations, neither a WLAN nor an authorized WWAN isimmediately available (block 824), in which case the mobile messengercontinues to scan for an available WWAN (block 860). If an authorizedWWAN becomes available (block 864) the WWAN connection is established(block 828), but otherwise the device continues its periodic scans fornew WLAN signals as well (block 832).

A process 900 for sending communications messages and tracking thestatus of communications messages is shown in FIG. 9. This process issuitable for use with the control system 200 of FIG. 2. The processbegins when the messaging server receives a communications message(block 904). This message may be sent from a mobile messenger associatedwith the controller, or a third party device. If recipient data sentwith the communications message identifies a known user in the userdatabase (block 908) the communications message is stored in the messagedatabase (block 916). The messaging server also stores metadataassociated with the message, such as address information of the senderand recipient, and the time of when the message was received. If anincoming message does not match a known user, however, the messagingserver returns an appropriate error message to the sender (block 912).After storing a communications message, the messaging server determineswhether or not the intended recipient's mobile messenger device isavailable to receive the message (block 920). In the event that thedevice is unavailable, the messaging server waits (block 924) until thedevice is available, possibly checking for updated status information inthe user database. The message metadata may include an optionalexpiration time, indicating the maximum time the messaging server shouldwait to send the communications message. Should this time expire, themessaging server sets an expired status in the message database andremoves the message from the queue of messages associated with the user.When the mobile messenger belonging to the recipient becomes available,the stored communications message is sent to the mobile messenger, whichacknowledges receipt of the message with the messaging server (block928). The messaging server sends receipt confirmation to thecommunications message sender, indicating the message has been delivered(block 932). The receipt information is also stored in the messagedatabase, allowing the sender or administrators to receive aconfirmation message indicating that the message was received, and thetime at which the message was received (block 936). After receipt of thecommunications message, the recipient mobile messenger device stores thesent message in its internal memory. Based on priority, the device mayimmediately display the message, or queue the message for userconvenience. At the time the communications message is displayed, themobile messenger sends an update message to the messaging serveracknowledging that the communications message has been displayed (block940). The messaging server subsequently sends a message informing theoriginal sender that the communications message has been displayed(block 944) and updates the message database to indicate when thearchived communications message was displayed (block 948).

A process 1000 for activating a new mobile messenger for a user havingan existing mobile messenger is shown in FIG. 10. In various operationalsituations, a registered user who has a first mobile messenger needs toswitch to a new mobile messenger. This need may occur if the firstmobile messenger device is lost or stolen. Additionally, many users mayonly have possession of a mobile messenger for a limited duration oftime, such as for the length of a work shift. At that time, the mobilemessenger device is returned and issued to another user. Process 1000enables an existing user to activate a new mobile messenger whilepreserving access to the stored communications messages and personalinformation associated with the user.

Process 1000 begins by activating a first mobile messenger andassociating the device with the user to which the device has been issued(block 1004). The activation process is described in more detail in FIG.5 and FIG. 6. The messaging server sends messages to the first mobiledevice in the normal course of operations (block 1008). The same usersubsequently activates a second mobile messenger (block 1012). Thecontrol system determines that the second mobile messenger is differentfrom the first mobile messenger by comparing the hardware identificationcode sent during the activation of the second mobile messenger with thehardware identification code of the first mobile messenger (block 1016).After the second mobile messenger is activated, it receives userinformation stored in the control system, including address booksholding contact information used by the user (block 1020). The controlsystem also sends any open messages, which are communications messagesthat have not expired and have not been acknowledged by the user (block1024). Once the user data and open communications messages are sent tothe second mobile messenger, the control system determines if the firstmobile messenger is reachable via any authorized wireless network (block1028). If the first mobile device is available, the control system sendsa reset command message (block 1036) that instructs the controller inthe first mobile messenger to delete all user configuration data andmessages (block 1040). When the first mobile messenger is initiallydisconnected from any wireless network, the controller waits to send thereset command message until after the first mobile messenger becomesavailable (block 1032).

A process 1100 for detecting a misplaced mobile messenger device is showin FIG. 11. While attempts to locate a misplaced mobile electroniccommunications device, such as a cellular phone, by calling the phoneand listening for its ring are known, this method, however, is notalways successful. For example, the success of the method may beaffected by a muted phone ringer or a low volume level. Process 1100begins with the user who lost the mobile messenger or an administratoraccessing the administration server of the control system (block 1104).This access may be done via another mobile messenger or through the useof a standard computer configured to access the administration server.The administration server sends a command message in response to arequest to have the mobile messenger emit an alarm (block 1108). Themisplaced mobile messenger receives the alarm command message, and emitsan audible alarm in response to the command message (block 1112). Inemitting the alarm, the mobile messenger may be configured to adjust itsvolume levels higher, including adjusting to the maximum availablevolume. Additionally, if the mobile messenger is equipped with avibration device or indicator lights, these devices may operate as partof the alarm. Thus, even if the mobile messenger was set to a low volumeor mute state, the mobile messenger still emits an audible alarm inresponse to the command message. If the mobile messenger is located(block 1116), the alarm may be deactivated manually by the user sendinga manual input to the mobile messenger (block 1124). After manualdeactivation, the mobile messenger may restore its volume level to thelevel used prior to receiving the alarm command message. If the mobilemessenger is not located within a predetermined amount of time, thealarm may deactivate in order to conserve energy (block 1120), andadditional alarm command messages may be sent at a later time.Alternatively, instead of sending multiple alarm command messages, themobile messenger may be configured to emit the alarm intermittently,such as sounding the alarm for five minutes with five minute periods ofsilence until the alarm is deactivated. This type of operation helpspreserve the battery life of the mobile messenger.

A process 1200 for adjusting the volume level of a mobile messengerdevice is shown in FIG. 12. A mobile messenger may be disruptive if itemits sounds in certain locations. A user may neglect to adjust thevolume level of the mobile messenger manually and it may emit unwantedsounds. Process 1200 begins with the control system periodicallypublishing control information for the subscribing mobile messenger toassign known locations to alternative volume levels or operational modesto the mobile messenger (block 1204). The location information sent maybe tailored to specific users. For example, a user who is an emergencymedical technician may continue to receive audible alerts from themobile messenger when the mobile messenger is connected to a wirelessnetwork in an emergency room. However, another user who is a medicaladministrator may have a mobile messenger whose volume levels are mutedor set to a vibrate-only mode when in the same emergency room. Thelocation information may include data identifying the particularwireless network device to which the mobile messenger is connected, suchas a unique basic service set identifier (BSSID) name for an 802.11access point, or tower identification information for a WWAN datanetwork cell. In embodiments of mobile messengers including a GPSdevice, the location data may include geographic coordinates, such aslatitude and longitude. In a building with a WLAN including multiple802.11 access points, the mobile messenger may obtain a more accurateposition by evaluating the relative signal strengths individual wirelessaccess points in the WLAN. A particular 802.11 access point may beidentified by decoding a basic service set identifier (BSSID) data fieldtransmitted by the access point. The BSSID is a unique hardwareidentifier for each wireless access point that is typically the same asthe MAC address associated with the 802.11 access point. The BSSIDuniquely identifies individual wireless access points in WLAN systemsusing multiple wireless access points, even if they share the sameservice set identifier (SSID). The mobile messenger may determine thesignal strengths and BSSIDs of wireless access points by passivelydetecting wireless data transmissions generated by the wireless accesspoint. This location method may include triangulation using BSSIDs sentfrom multiple access points to determine which floor or room of aparticular building the messenger is located.

A mobile messenger subscribes to a published list of known BSSIDsassociated with known locations where the mobile messenger is configuredto operate in a non-standard mode, such as the WAN exclusion zonesdiscussed above or in locations where an automatic volume level shouldbe set. After receiving auto-volume location information from thecontrol system, the mobile messenger determines whether its currentlocation corresponds to one of the stored locations in which anautomatically set volume level is desired for the mobile messenger(block 1212). The mobile messenger then adjusts its volume level inresponse to the location information stored in its memory (block 1220).The volume level stored for a given location may mute the mobilemessenger, set it to a lower or higher than normal volume level, oractivate an alternative message alert mode such as a vibrate-only mode.In an alternative embodiment, the mobile messenger reports detectedlocation information to the control system. The control system thendetermines if the reported position corresponds to a location where themobile messenger should operate in a non-standard mode, including modeswith automatically adjusted volume levels. The control system then sendsa command message instructing the mobile messenger to change operatingmodes, including commanding the mobile messenger to adjust its volumelevel. In either embodiment, the volume levels may be overridden basedon the priority of an incoming message. An emergency message might beallowed to generate an audible sound even if normal priority messagesare muted. An administrator request that the control system set thevolume level for generating alerts in response to receivinghigh-priority messages, and enable the messenger to override auser-defined volume level to generate the sound. As part of the volumelevel adjustment, the messenger may be configured to store the volumelevel used prior to receiving the command message.

In the event that the mobile messenger determines it is not in alocation with an auto-volume adjustment (block 1212), the messenger maydetermine if the currently set volume level was set in response to themobile messenger being in a different location where the auto-volumeadjustment was made (block 1224). If this was the case, the mobilemessenger may retrieve a previously used manual volume level setting andadjust the volume level to the previous volume level (block 1228). Thevolume level remains unchanged in situations where no previously setvolume is saved (block 1232).

Mobile messenger devices receive address book information thatfacilitates contacting parties listed in the address book. Address bookinformation may include any data useful in identifying and communicatingwith another party via the mobile messenger. Such data may includeelectronic contact information such as the party's name, relevant phonenumbers, email addresses, screen names for instant messaging, andaccount names in social network applications. Address book informationmay additionally include biographical information about the partyincluding a picture, age, work title, work location address, and homestreet address. Using the location information described above, addressbook information may further include the physical location of the mobilemessenger belonging to a party, and the location information may beupdated automatically in response to the mobile messenger changinglocation. An example of a data format for storing address bookinformation in a structured manner is the vCard format.

A process 1300 of distributing the address book information is depictedin FIG. 13. Process 1300 begins by establishing an address book entryfor a party (block 1304). Each mobile messenger user is a party inprocess 1300, but a party does not necessarily need to use a mobilemessenger to have address information. For example, in a mobilemessenger network deployed in a hospital, there may be a number ofparties who have address book information established who do not usemobile messenger devices. Examples include third-party doctors who referpatients to the hospital but are not part of the hospital itself, andoutside pharmacists who fill prescriptions from doctors in the hospital.While these parties may not use mobile messenger devices, address bookinformation is still established to permit mobile messenger users tocommunicate with them via the messaging server. Once established,address information for each party is stored in the messaging databasein the control system. After establishing the address book information,each address entry is published, enabling one or more subscribers toview the address book information (block 1308). In the embodiment ofFIG. 2, messaging server 208 may publish the address book informationfor one or more subscribing mobile messengers. Process 1300 continues byhaving mobile messenger users receive address book information bysubscribing to one or more address entry publisher nodes (block 1312).When a mobile messenger device is activated, a default set ofsubscriptions is automatically established for the mobile messenger. Thedefault subscription list may be established by administrators via theadministration server, and each mobile messenger may receive a defaultsubscription list tailored to the expected communications patterns ofthe mobile messenger user. In addition to the default subscription list,a mobile messenger user may manually subscribe to another party whoseentry is not in the default subscription list (block 1316). The manuallyadded subscription relationships are stored centrally in the controlsystem, enabling manually added address book subscriptions to beretained in the event that a mobile messenger user changes mobilemessenger devices. The administrator may disable manual address bookentries and subscriptions to address book lists other than the defaultaddress book list via the administrative interface.

In the event that address book information associated with a party isupdated (block 1320), the newly updated address book information isre-published by the publishing node (block 1324) and is subsequentlyreceived by the subscribing mobile messengers (block 1328). Each mobilemessenger user may update his or her own address book information via anaddress book software interface provided by the mobile messenger.Updates to the address book are then stored in the user database forre-publication by the publishing node. The pubsub mechanism permits anupdate to an address book entry for a single party in the address bookto be distributed to the mobile messengers individually, instead ofrequiring redistribution of an entire address book when only a limitedsubset of address book entries have been updated. The update mechanismalso sends to the updated address book information to subscribing mobilemessengers while refraining from sending the address book tonon-subscribers. These features enable efficient distribution of addressbook information that reduces the volume of information that is sent tothe mobile messenger devices.

While the address book information distribution process described aboveis suited for use with a network of mobile messenger devices, it may beapplied to different network computing systems as well. Any network ofcomputing devices sharing address book information may employ theforegoing method to maintain address book information in an efficientmanner.

A process 1400 for sending control and configuration messages to mobilemessenger devices via a pubsub mechanism is depicted in FIG. 14. Process1400 begins by subscribing one or more devices, such as mobilemessengers, to a single publisher that is associated with a controlgroup (block 1404). A control group is associated with a group ofdevices that are all configured to receive the same command andconfiguration data. For example, a subset of mobile messenger devicesbelonging to doctors in a hospital may belong to a single control group,while a second subset of mobile messenger devices belonging to nursesbelongs to a different control group. In one embodiment, thesubscription to the command group is established when the mobilemessenger device is initially activated. In the exemplary embodiment ofFIG. 2, the administration server is configured as the publisher nodepublishing control and configuration data for one or more controlgroups.

An administrator sends command and configuration change requests to acontrol system, such as control system 200. When a new command orconfiguration message is sent, the publisher node associated with thecontrol group publishes the message (block 1408). Possible configurationmessages include updates to listings of approved WLAN access points, andupdates to listings of locations where the mobile messenger shoulddeactivate its WWAN transceiver or set an automatic volume level.Command messages include messages instructing mobile messengers toupdate internal software or firmware code, or to activate or deactivatefeatures or functionality in response to the command message. Variousconfigurable mobile messenger functions include text messaging, voiceover Internet Protocol (VoIP) communications, instant messagingservices, subscriptions to address book lists, group pagingfunctionality, and various other functions that the mobile messenger mayperform. Administrators may use the control system to updateconfiguration information including lists of approved wireless accesspoints, lists of locations where mobile messengers should deactivatecellular transceivers, and lists of locations where the mobilemessengers should change the volume level used for audible alerts.

In one mode of operation, command messages and configuration data areprepared by administrators using the administration server and aresubsequently published for a corresponding control group. The subscribermobile messenger devices receive the command and configuration messagesvia the pubsub mechanism, and take a predetermined action in response tothe particular received message (block 1412).

In the event that a mobile messenger device changes from a first controlgroup to a second control group (block 1416), the mobile messengerestablishes a subscription to the publishing node for the second controlgroup (block 1420) and removes its subscription from the first controlgroup (1424). At this point, the mobile messenger receives command andconfiguration updates from the second control group publisher instead ofthe first control group publisher. Upon changing control groups, themobile messenger may be initialized with one or more control andconfiguration messages published by the publisher node of the secondcontrol group. The mobile messenger reconfigures itself in response tothese messages to match the configuration of other mobile messengers inthe same control group.

While the command and configuration process described above is suitedfor use with a network of mobile messenger devices, it may be applied todifferent network computing systems as well. Various groups of networkedcomputing devices sharing common control and configuration data may beefficiently managed using process 1400. One suitable example of analternative system is a Supervisory Control and Data Acquisition (SCADA)system that has a number of network sensor or control devices that arecontrolled from a centralized server. Process 1400 enables selection andconfiguration of groups of sensor and control devices in an efficientmanner.

A process 1500 for collecting reporting information from a group ofmobile messenger devices using a pubsub protocol is depicted in FIG. 15.Reporting information is generated by a mobile messenger during itsnormal course of operation. The reported information may include devicediagnostics including battery life, temperature, and the status andversion of operating software. Other reports may detail the mobilemessenger's activities, including bandwidth usage for each wirelessnetwork that the mobile messenger accesses, and statistics on the numberof messages the wireless device has sent or received. The mobilemessenger establishes a publisher node for at least one type of reportinformation (block 1504). The mobile messenger may optionally establishmultiple publisher nodes dedicated to a specific subset of reportinginformation having relevance to different subscribers. For example, apublisher node that publishes bandwidth usage is of interest to asubscriber monitoring billing for network usage, while a publisher nodepublishing battery life information is of interest to a maintenancesubscriber monitoring for failing batteries. Different administrativesubscribers establish subscriptions to the appropriate publisher nodesin each mobile messenger device (block 1508). In process 1500, each ofthe mobile messengers acts as a publisher, while one or more subscribersreceive published reports using the administration server. Using theembodiment of FIG. 2, the administration server acts as a singlesubscriber computing device for collecting report data published by eachmobile messenger. The administration server may host multiple logicalsubscribers on a single physical computing device.

Mobile messengers generate report information at periodic intervals, inresponse to an event detected by the mobile messenger, or in response toa command message received by the mobile messenger. The generated reportinformation is then published by the appropriate publisher node (block1516), and the subscribing administration server receives the publishedreport (block 1520). Once the subscriber has received published reports,the reports may be stored or organized for access by administrativeusers (block 1524). In the example embodiment of FIG. 2, the reportsgenerated by a mobile messenger assigned to a particular user may bestored in the user directory database. Administrators may review thereport information for a single device, or view consolidated reportscorresponding to multiple mobile messengers. The administrators accessthese reports via the administrative interface hosted on theadministration server. Thus, the administration server acts as asubscriber, while individual administrators access some or all of thestored reports instead of directly subscribing to individual mobilemessenger devices.

While the reporting information collection process described above issuited for use with a network of mobile messenger devices, it may beapplied to different network computing systems as well. A systemincluding a centralized control enabling administrators to viewdiagnostic and status information of multiple networked computingdevices may employ process 1500. Some examples of these systems includethe aforementioned SCADA systems. Another example includes centrallymanaged enterprise computing networks having networked computing devicesincluding computer workstations and networked printers.

A control system, such as control system 200, collects the report datathat the subscribing administrative server receives. Differentadministrators may have access to the report data through theadministrator interface portal. The portal may display unedited reportdata for one or more mobile messenger devices, or generate aggregatedata including graphs and statistics that provide information on theoperation of the mobile messengers, wide area network, and local areanetworks. Administrators may access the administrator interface portalin the control system to review reports of warning and error messagesthat one or more mobile messengers generate during operation. Theseerrors may indicate hardware faults in certain mobile messenger units,or may indicate wider problems with one or more wireless networksincluding weak signals or interference with a wireless access point. Thereports may also include records of maintenance or remedial measurestaken to resolve reported problems.

Reports directed to the operating condition of networks that support themobile messengers include graphs showing outages or downtime of variouswireless access points and wireless towers, graphs of bandwidth usageand network capacity utilization, and graphs of the storage capacityusage of databases including the message database and user directorydatabase. The mobile messengers may report average network latency andresponse times to generate network performance metrics that measure theaverage delivery time for messages on the network and the average delaybetween when the control system publishes various data, includingaddress book updates, and when subscribing mobile messengers receive thepublished data.

The administrator may access the administrative interface to viewaccounting data including bandwidth usage statistics for each mobilemessenger, including the amount of data that each mobile messenger sendsand receives using wide area networks and local area networks in variouslocations. Since many wide area networks charge fees that areproportional to network utilization, the accounting data may identifylocations where WLAN access points reduce operating costs. Theadministrators may also disable certain functions for mobile messengerusers that exceed predetermined data usage caps on wide area networks.For example, a mobile messenger user may have a data usage cap forsending and receiving data via the WWAN of 10 megabytes per month. Theadministrator may publish a control message that disables sending andreceiving VoIP messages using the WWAN upon exceeding the cap, but stillenables sending and receiving of VoIP messages via the WLAN.

Another administrator report feature enables the administrators to viewthe locations of different mobile messenger devices on a map. The mobilemessenger devices report various forms of location information that mayinclude positioning data from a global positioning system, or mayinclude location data generated from one or more WLAN and WWANtransceivers having known locations. The portal may display thelocations for all mobile messengers or for a select subset of mobilemessengers superimposed on a map. The map may cover a larger geographicarea, such as a city or state, or may depict an individual building,such as an office building. When only approximate location data areavailable for a mobile messenger, the map may indicate that the locationis an approximation and include a confidence circle or other estimate ofthe accuracy of the location. When a mobile messenger is not incommunication with the control system, the portal may display the lastknown location of the mobile messenger on the map.

In addition to report information collected directly from mobilemessenger devices, various auditing devices may also test networkperformance and generate report data. These devices may employ wirelesstransceivers that are similar to the mobile messengers, but sendautomated test messages and reports to the control system instead ofsending communications messages. Other auditing systems include softwaresystems that collect accounting and performance data from networkcomponents, such as wireless access points. Mobile messenger devices andautomated auditing systems generate report data without requiring manualcontrol from a mobile messenger user. A mobile messenger may defertransmission of report data to the control system for storage andanalysis until there is a period of low network utilization. In someembodiments, mobile messengers only send report data to the controlsystem using WLAN networks to reduce the bandwidth usage and costsincurred from utilizing WWAN networks.

FIG. 17 depicts a process 1700 for compression of data sent and receivedby the control system and mobile messengers during the processesdepicted above in FIG. 5-FIG. 16. Both the control system and mobilemessenger devices include a compressor and decompressor for compressingand decompressing, respectively, data such as communications messages,authentication data, and control messages. The compressor generatescompressed data that store the same contents as the originaluncompressed data using fewer bytes than the original data, and thedecompressor may generate the original data from the compressed data.Various block compression implementations, including software andhardware that implement the DEFLATE and LZW block compressionalgorithms, may be used to compress data prior to sending the data viaWLAN and WWAN networks. After the compressed data are sent, acorresponding decompressor generates the original message data from thecompressed data. The level of compression offered by the blockcompressor improves when a relatively large amount of data havingsimilar statistical properties, such as entropy and symbol frequency,are provided to the compressor. The compressor generates an internaldictionary from the previously compressed data to improve thecompression of subsequently received data having similar statisticalproperties. Various operations of the mobile messengers and controlsystem, however, involve sending multiple smaller data messages that aretoo short to enable the compressor to generate an internal dictionaryfor efficient compression. Process 1700 provides a method for efficientcompression and decompression of the shorter messages.

In process 1700, the control system and each of the mobile messengerseach compress an identical set of seed data using a predeterminedcompression and decompression scheme (block 1704). As used herein, theterm “seed data” refers to a predetermined set of data that are suitablefor compression by the compressor and decompression by the decompressor.Seed data for the compressor may include samples of uncompressed messagedata. The compressor may generate seed data for the decompressor bycompressing the predetermined seed data. Identical seed data are storedin data storage devices within the control system and the mobilemessengers, to enable compressors and decompressors in separatecomputing devices to share the same internal dictionaries generated fromthe seed data. The control system and each of the mobile messengersinclude a compressor and decompressor. The compressor for the controlsystem and the decompressor for each mobile messenger share a first setof identical seed data, and the compressor for the mobile messengers andthe decompressor for the control system share a second set of identicalseed data. In one embodiment, the first set of seed data and second setof seed data may be the same. In an alternative embodiment, the firstand second sets of seed data are different. The first set of seed dataare selected with reference to messages that the control system sends tothe mobile messengers, and the second set of seed data are selected towith reference to the messages that the mobile messengers send to thecontrol system. The compressor in each mobile messenger may include anindividual set of seed data adapted for the profile of messages used inthe mobile messenger, and the control system may store correspondingseed data for multiple mobile messenger devices.

The size of each set of seed data is selected to be sufficient to enablethe compressor to generate an internal dictionary to optimize subsequentdata that have statistics that are similar to the seed data. The sizesof seed data may change during operation with one embodiment providingan initial 32 Kilobytes of seed data that may grow to a maximumconfigured size of 64 Kilobytes. In one embodiment, the contents of eachmessage compressed using a compressor are appended to the seed data usedto generate dictionaries in the compressor and correspondingdecompressor. The seed data may grow from the initial size until seeddata reach the maximum configured size. In one embodiment, the seed datagrows until the maximum configured size and remains constant thereafter.In another embodiment, the seed data are updated with the contents ofeach new message, and a corresponding set of the oldest data in the seeddata set are removed to maintain the size of the seed data.

The compressed seed data are provided to a decompressor to generate aninternal dictionary used for decompression (block 1708). Thedecompression may be optional in some embodiments where compressor anddecompressor share the same internal dictionary and internal state. Theinternal dictionaries may be cached in a memory to enable the compressorand decompressor to operate on multiple messages without processing theseed data multiple times. The hardware and software embodiments of thecompressor may be different between mobile messengers and the controlsystem provided that the implementations produce compatible compressedand decompressed data.

During operation, the control system or mobile messenger generates datafor a new message (block 1712). The new data are then provided to thecompressor that is configured with the internal dictionary generatedfrom the seed data. The compressor generates compressed data thatcorrespond to the new data message using the previously generatedinternal dictionary (block 1716). This internal dictionary enables ahigher compression ratio and smaller size for the compressed data whencompared to compressing the message data without using the seed data.The compressed data are then sent to the recipient device via a WLAN orWWAN (block 1720). Once received, the recipient device decompresses thecompressed message using a decompressor that has an internal dictionarygenerated using the same seed data used prior to compressing the data(block 1724). Thus, the decompressor is configured to decompress thecompressed data corresponding to the new message.

Process 1700 enables compression of shorter data messages with improvedcompression ratios to reduce the total amount of message data sent viaWLAN and WWAN networks. The improved compression reduces utilization andcongestion of the wireless networks and reduces operating costs forwireless networks that charge based on data usage. The selection of seeddata mimics the expected statistical properties of data sent andreceived by the control system and mobile messenger devices. Forexample, in systems using XML based communications protocols, the seeddata may be a string including sample XML messages that match the formatof communications messages and command messages.

The mobile messenger devices and central control system 200 of FIG. 2may be adapted to perform one or more of processes described above. Eachof mobile messengers 232A-232D may store a subscriber configuration inmemory instructing each mobile messenger to subscribe to one or moreaddress book publisher nodes and to a single control group publishernode. Using the example pubsub scheme of the Publish-Subscribe extensionto the XMPP protocol, each mobile messenger further stores a uniformresource locator (URL) of each publisher node in its memory. The mobilemessengers then receive notification of published address book entriesas well as configuration and command messages via data networks such asWAN 220 or LAN 222. Control system 200 acts as the publisher for addressbook and control group information. Messaging server 208 may beconfigured to read user address information stored in user database 212and publish the information, including publishing updates to addressbook entries when address information changes. Administration server 204receives commands sent via the administration interface and isconfigured to act at the publisher node for one or more command groups.The command group publisher nodes publish command and configurationinformation that is received by the targeted subscriber mobilemessengers via WAN 220 or LAN 222. For reporting process 1500, mobilemessengers 232A-232D are configured to be publishers, providing devicestatistics from hardware sensors and the memory in each mobilemessenger. Administration server 204 is configured to subscribe to thepublisher nodes of each mobile messenger. This configuration may includeextracting appropriate publisher URLs for each device from hardwareinformation stored in user database 212. Administration server 204 isfurther configured to store published reporting data received via itssubscriptions in user database 212, and to provide an interface foradministrators to view the information via the administrator interfacediscussed above.

One advantage of the mobile messenger and control system described aboveis the ability to reduce substantially the reliance of a wireless deviceon cellular networks or services supported by cellular networks. Forexample, an application program that implements the functionalitydescribed above may be developed for a cellular phone having 3G or 4Gdata communication capability. As long as the cellular phone alsoincludes a wireless transceiver for 802.11 networks, the applicationprogram, once installed, may operate in response to detection of a802.11 network access point or a command message received from a centralcommand site to disable the WWAN transceiver, but still implement the 3Gor 4G data communication services as well as the voice communicationservices through the 802.11 network transceiver. Because 802.11 networkaccess is frequently provided at no cost to users, the device is stillable to provide the higher level data and voice communicationfunctionality without causing the user to incur the higher cellularnetwork charge rates. Thus, smartphones or cellular phones with such aninstalled application program may now be used as pager devices withoutrequiring the enterprise, such as a hospital or police department, topay higher monthly service plans as required for devices that primarilyrely on cellular networks or services provided through cellularnetworks. A cellular service may even provide cellular phones orsmartphones so configured to enterprises with lower cost service plans.In this manner, the functionality of cellular phones and smartphones maybe provided to enterprises at rates that enable the devices to replacepagers without adversely impacting the bandwidth of the cellularservices for other users who require relatively constant cellularnetwork access.

While the system and method for device control have been illustrated bythe description of exemplary processes and system components, and whilethe various processes and components have been described in considerabledetail, applicant does not intend to restrict or in any limit the scopeof the appended claims to such detail. Additional advantages andmodifications will also readily appear to those skilled in the art.Therefore, the system and method described above in their broadestaspects are not limited to the specific details, implementations, orillustrative examples shown and described. Accordingly, departures maybe made from such details without departing from the spirit or scope ofapplicant's disclosed system and method.

We claim:
 1. A mobile electronic communications device comprising: ahousing; a memory; a data entry mechanism; a display for visual data; atleast one wireless transceiver, the at least one wireless transceiverconfigured to transmit and receive data via electromagnetic signalsconforming to a plurality of wireless signaling protocols; a controller,the controller being communicatively connected to the memory, data entrymechanism, display, and audio output, and being configured to send andreceive data using the at least one wireless transceiver; the controlleradditionally configured to: detect available wireless networks throughwhich the at least one wireless transceiver is able to send and receivedata using at least one of the plurality of wireless signalingprotocols; compare network identifications of available wirelessnetworks to a predetermined list of network identifications ordered bypreference; establish a wireless network connection with an availablewireless network having a network identification corresponding to a mostpreferred network identification in the predetermined list of networkidentifications for which a wireless network is available; and executean authentication process in response to establishing the wirelessnetwork connection.
 2. The mobile electronic communications device ofclaim 1, the controller being further configured, as part of theauthentication process execution, to: operate the at least onetransceiver to transmit authentication data sent to the controller bythe data entry mechanism; and determine if an acknowledgement messagereceived by the at least one transceiver in response to transmittedauthentication data indicates a successful authentication result.
 3. Themobile electronic communications device of claim 1, the controllerfurther configured to: detect that the mobile electronic communicationsdevice is in a location; compare the location to a list of at least oneexclusion zone locations stored in the memory; and deactivate at leastone of the at least one wireless transceivers in response to thelocation matching an exclusion zone location in the list of at least oneexclusion zone locations.
 4. The mobile electronic communications deviceof claim 1 further comprising: an audio output; an actuator configuredto adjust a volume level of the audio output; and the controller beingfurther configured to adjust the volume level of the audio output to asecond volume level in response to the controller detecting that themobile electronic communications device is in a location, the locationmatching at least one of a list of predetermined locations stored in thememory.
 5. The mobile electronic communications device of claim 1, thecontroller further configured to: receive at least one command messagethrough the at least one wireless transceiver; and execute at least onecommand contained in the at least one command message.
 6. The mobileelectronic communications device of claim 5, the controller furtherconfigured to delete at least a portion of data stored in the memory inresponse to a command message that includes a data deletion command. 7.The mobile electronic communications device of claim 5 furthercomprising: an audio output; and the controller being further configuredto emit sound through the audio output in response to receiving acommand message that includes an alarm condition command.
 8. The mobileelectronic communications device of claim 7, the controller furtherconfigured to store a first volume level in the memory prior toadjusting the volume level of the audio output to the second volumelevel, and to adjust the volume level of the audio output to the firstvolume level subsequent to adjustment of the volume level of the audiooutput to the second volume level.
 9. The mobile electroniccommunications device of claim 1, the controller further comprising: acompressor, the compressor configured to read seed data from the memory,to generate compressed seed data, and to compress at least one other setof uncompressed data for transmission by the at least one wirelesstransceiver after compressing the seed data; and a decompressor, thedecompressor being configured to read the compressed seed data generatedby the compressor, to decompress the compressed seed data, and todecompress at least one other set of compressed data received by the atleast one wireless transceiver after decompressing the seed data. 10.The mobile electronic communications device of claim 1, the controllerbeing further configured to: identify a priority level in datacorresponding to a communications message received from the at least onewireless transceiver; display the communications message on the displayfor visual data in response to the identified priority level beinggreater than or equal to a first predetermined priority level; displayat least one predetermined response to the communications message on thedisplay for visual data in response to the identified priority levelbeing greater than or equal to the first predetermined priority level;and generate a response data message for transmission by the at leastone wireless transceiver that corresponds to one of the at least onepredetermined responses to the communications message.
 11. A system formanaging mobile electronic communications devices comprising: a userdirectory database configured to hold authentication data associatedwith at least one user; an authentication authority communicativelyconnected to the user directory database, the authentication authorityconfigured to: accept or deny authentication data for a user receivedfrom at least one mobile electronic communications device; to storestatus information corresponding to authenticated users in the userdirectory database; and to store an association between eachauthenticated user and each mobile electronic device that sentauthentication data for an authenticated user in the user directorydatabase; an administration server configured to send and receivecommand messages with at least one mobile electronic communicationsdevice; a messaging server configured to send and receive communicationsmessages with at least one mobile electronic communications device; andthe authentication authority, administration server, and messagingserver being configured to send and receive data via a datacommunications network.
 12. The system of claim 11 wherein theadministration server is further configured to: identify that a secondmobile electronic communications device sending valid authenticationdata for a user is different from a first mobile electroniccommunications device associated with the user in the user directorydatabase; and to send a command message to the first mobile electroniccommunications device in response to the second mobile electroniccommunications device sending valid authentication data, the firstmobile electronic communications device being configured to erase atleast a portion of data stored in a memory in the first mobileelectronic communications device in response to receiving the commandmessage.
 13. The system of claim 11 wherein the administration server isfurther configured to send a command message having an alarm command toa mobile electronic communications device.
 14. The system of claim 13wherein the alarm command identifies a volume level for an audiblealarm.
 15. The system of claim 11 wherein the administration server isfurther configured to send at least one list containing at least onelocation identifier to a mobile electronic communications device. 16.The system of claim 15 wherein the at least list includes at least onelocation identifier associated with a location in which the mobileelectronic communications device is configured to operate with anautomatically adjusted volume setting.
 17. The system of claim 15wherein the at least list includes at least one location identifierassociated with a location in which the mobile electronic communicationsdevice is configured to deactivate a wireless transceiver.
 18. Thesystem of claim 11 wherein the user directory database includes aplurality of paging group records, each paging group record identifyinga plurality of users in the user directory database, and wherein themessaging server is configured to send a communications message to eachuser identified by the paging group record in response to thecommunications message identifying the paging group.
 19. The system ofclaim 18 wherein the messaging server is further configured to store anumber of acknowledgement messages generated in response to thecommunications message that identifies the paging group.
 20. The systemof claim 11 further comprising: a message archive database; themessaging server being further configured to: retain copies of sent andreceived communications messages in the message archive database; sendat least one retained communications message held in the message archivedatabase to at least one authenticated mobile electronic communicationsdevice; maintain a record of an acknowledgment message sent from areceiving mobile electronic communications device, the acknowledgementmessage acknowledging receipt of a communications message; and maintaina record of a second acknowledgment message sent from a displayingmobile electronic communications device, the second acknowledgmentmessage including an acknowledgment that the mobile electroniccommunications device displayed a received communications message. 21.The system of claim 20 wherein the messaging server is furtherconfigured to send at least a portion of data associated with a user inthe user directory database to an authenticated mobile electroniccommunications device providing authentication data corresponding to theuser.
 22. The system of claim 20 wherein the administration server andmessaging server are further configured to: identify a second mobileelectronic communications device sending valid authentication data for auser, the second mobile electronic communications device being differentfrom a first mobile electronic communications device associated with theuser in the user directory database; send at least a portion of thecopies of sent and received communications messages retained in themessage archive database to the second mobile electronic communicationsdevice; and to send a command message to the first mobile electroniccommunications device in response to the second mobile electroniccommunications device sending valid authentication data.
 23. The systemof claim 22 wherein the first mobile electronic communications device isconfigured to erase at least a portion of data stored in a memory in thefirst mobile electronic communications device in response to receivingthe command message.
 24. The system of claim 20, the administrationserver further configured to provide access to at least oneadministrator, the administration server allowing the at least oneadministrator to read: at least a portion of copies of communicationsmessages held in the message archive database; at least a portion ofrecords of acknowledgment messages that include acknowledgments that amobile electronic communications device received a communicationsmessage; at least a portion of records of second acknowledgment messagesthat include acknowledgments that a mobile electronic communicationsdevice displayed a received communications message.
 25. The system ofclaim 11 further comprising: a non-volatile memory; a compressor, thecompressor configured to read seed data from the non-volatile memory, togenerate compressed seed data, and to compress at least one other set ofuncompressed data for transmission by at least one of the messagingserver, administration server, and authentication authority aftercompressing the seed data; and a decompressor, the decompressor beingconfigured to read the compressed seed data generated by the compressor,to decompress the compressed seed data, and to decompress at least oneother set of compressed data received by the at least one of themessaging server, administration server, and authentication authorityafter decompressing the seed data.
 26. An application program stored ona computer readable medium, wherein a controller in a two-way electroniccommunications device executes the application program to enable one ofa first wireless transceiver and a second wireless transceiver for datacommunication and to disable the other of the first wireless transceiverand the second wireless transceiver for data communication in responseto a detected network identifier obtained without user interaction. 27.The program of claim 26, wherein the controller executes the applicationprogram to enable one of the first wireless transceiver and secondwireless transceiver and to disable the other of the first wirelesstransceiver and second wireless transceiver by comparing the detectednetwork identifier for a detected wireless network to a predeterminedlist of network identifiers, and determining whether the networkidentifier of the detected wireless network has a higher priority than anetwork identifier for a type of wireless network through which theother wireless network transceiver communicates.
 28. The program ofclaim 26, wherein the controller executes the application program todisable at least one of the first wireless transceiver and secondwireless transceiver in response to a detected location corresponding toa location stored in a predetermined list of locations.
 29. The programof claim 26, the controller executes the application program to selectone of a first wireless transceiver that communicates through a cellularnetwork and a second wireless transceiver that communicates through an802.11 standard network.
 30. A method for delivering data from a firstnetwork computing device to a subscriber computing device comprising:establishing at least one publisher node in a network computing device;configuring a subscriber computing device with a subscription to the atleast one publisher node; generating a data message for publication bythe at least one publisher node; transmitting the data message from theat least one publisher node to the subscriber computing device with thesubscription; generating a receipt message in the subscriber computingdevice that corresponds to the data message; and transmitting thereceipt message from the subscriber computing device to the networkcomputing device.
 31. The method of claim 30 further comprising:transmitting the data message from the at least one publisher node tothe subscriber computing device a predetermined number of times; andgenerating a record that indicates that the subscriber computing devicefailed to receive the data message in response to the subscribercomputing device failing to send a receipt message to the networkcomputer device in response to any one of the transmitted data messages.32. The method of claim 30 further comprising: generating a versionnumber corresponding to the data message generated by the publishernode; identifying a version number stored in the subscriber computingdevice; and transmitting the data message from the at least onepublisher node to the subscriber computing device in response to theversion number corresponding to the data message being greater than theversion number stored in the subscriber computing device.
 33. The methodof claim 30 further comprising: storing the data message generated bythe publisher node in a memory in the publisher node; and removing asecond data message having a second version number generated by thepublisher node from the memory in response to the data message generatedby the publisher node having a version number that is greater than thesecond version number.